Falsely claiming PTSD for VA benefits?

This sounds more like a dissociative disorder than ptsd so one could argue a preexisting condition before even enlisting in the army but service likely exacerbated it so he'd still be eligible for compensation if he was previously undiagnosed.

Falsely claiming anything for VA benefits is fraud, plain and simple.

You obviously don’t know a Damn thing about PTSD if you think people are defrauding the government! If they are then let the government deal with them. I don’t think it’s your job. You must be a Trumpster!

Frankly, I do have the credentials and the people at the VA scare me. They can be unprofessional at times, don't like anyone whose on equal footing with them disagreeing with their assessment or the next thing you know, you're combative, argumentative, and disruptive. I've been a counselor going on 18 years and I want people to feel at ease when they talk to me. These are soldiers, not angels, sometimes they may swear during a session. If you do at the VA, you get reported to the Disruptive Behavior Committee and all those hearings are behind your back without your knowledge and your file flagged. This can get very serious as the VA counselors have too much power, some even thinking they're gods. Every state's congressional office gets flooded with complaints from veterans about the mental health care, or lack thereof, they receive from the VA.

Have had lots of experience with this during my 30 year career as a VA social worker.

Do some falsely claim it yes it happens. Can you prove it 99.99999% of the time? Nope!
That is their own conscious they have to bear!

My BIL is perfect example. He is near idiot but got in the Army via political intervention. He never served outside of the US. He was assigned to gymnasium. Yet today he has 100% disability... PTSD.

If the soldier truly has PTSD, it doesn't matter if it was a pre-existing condition so long as he can show it was made worse by his service. As for eligibility for CCA - that's beyond my paygrade. But I'll tell you that I have never met a combat veteran that did not have PTSD to one degree or another, and I would trust the ones I know with a weapon without hesitation.
If he doesn't have PTSD and is simply trying to get benefits he is not entitled to, he can be done for fraud and, if convicted he will be held liable to repay every penny he received in VA benefit (after he gets out from prison).
He should also be horse-whipped and shunned as a person of no moral worth. Full stop.

Well even a death in the family at incident off duty is qualified to give service connection for PTSD. If this person is not compliant with treatment or meds that is normal but the claim that he is cured allows VA to re-evaluate his current condition because until he has suffered for 20 years after the effective date, VA can reduce his award to any level including zero percent.

PTSD is not limited to combat and has such a low bar for qualifying event, those who suffer from combat or rape or even a bad car accident can’t relate to the many other ways PTSD can be service connected to include a preexisting condition aggravated during service, not necessarily by service. If he is cured and telling everyone that report it to the VA IG and let them look into it. The notes in the file may result in an evaluation of the current severity of his mental health, if he fought for 12 years then they have appropriately 8 years to reduce it or discover fraud. There is a system in place, but VA waste’s most of their resources having to go through appeals on so many conditions where the denial or low rating is due only to negligence of the VA employee who fails to actually do their job then VA defends wrong decisions until told by a judge they are wrong then drags out the process 2-3 times longer than before complying with the judge. Because of this they are slow to look into cases like you describe because they need more than your word since the benefit of every doubt must be resolved in favor of that veteran. If the compensation & pension people did their job correctly in the first place they would have thousands of man hours available to handle fraud or reducing ratings when the law supports it. Until then, this is lower on their priority list, especially since it is likely you do not know every detail of this veterans case or how they are coping, skills learned in therapy are preferred over medication and medication is not effective for all plus for many becomes less effective over time, where learned coping skills and increased dosage are only so helpful. Va denies so many benefits and does not understand that there are so many safeguards written into title 38 to allow those even with dishonorable service compensation and other benefits, even if the dishonorable conduct had nothing to do with their service connected conditions.

Many discharges are the result of the service failing to treat the service member for conditions, many mental health either caused or aggravated by their service. This one individual possibly improving and not having his rating reduced is so minor considering all the others left hung out to dry where even the free representation of veterans service organizations like VFW & DAV is denied these individuals because of plain ignorance of the VA and service organization employees who refuse to read title 38 and deny assistance usually falsely informing the service member that they have no rights to compensation.

Let’s all put pride and ego aside and help those who are entitled to benefits get them so VA can focus on those faking later

The VA has claims adjudicators to make these decisions because they can verify the real facts of the case.