As of 2024, does Fort Eisenhower allow you to volunteer for just Airborne School during 25B AIT?

Unless you are going to an Airborne unit, it is very difficult to get the Army to send a lower enlisted Soldier to a school they will not use. Airborne is a special skill, and it is an expensive school. Some Soldiers get slots for the school only, but every one of them that I ever met was either an officer that went when at the Academy or in ROTC, or they were at Fort Benning right after OCS or between schools, but still on Fort Benning, or the enlisted Soldiers were permanent party at Fort Benning and were able to use the school slot as part of a re-enlistment incentive package or similar.
Short answer, if you want jump wings, volunteer to go to the 82d Airborne Division, You'll be glad that you did.

I find it odd that an IET Soldier, not yet completed AIT (not even arrived at AIT yet), already has a pinpoint guaranteed assignment upon completion of AIT.

Chances are, you will not be asked if you want to go Airborne when you get to Eisenhower. What will more than likely happen is that you will have to wait until you get to Riley, stay a certain length of time, then submit a PAR in IPPS-A to go to Airborne School. I am not saying this is your only path, just that this is the more likely path. You can certainly see if there are Airborne Recruiting offices at Eisenhower.

As for Riley, why are you to trying to go anywhere but there? There are some places many folks would consider worse than Riley.

As for ACFT requirements for BAC, here is a link for you:

https://www.moore.army.mil/Infantry/ARTB/1-507th/Airborne/Entrance-Req.html

This will sound dumb but, where the he'll is Ft Eisenhower? Never heard of it.