U.S. Put 92 Somalis on a Deportation Flight, Then Brought Them Back

"In an emailed statement on Friday, the agency said it was notified that a relief flight crew was “unable to get sufficient crew rest due to issues with their hotel in Dakar,” so the aircraft and detainees spent time parked at the airport there."

If this is correct, then how did they make it back to the US? The same 'crew rest' rules would have applied either way; so what is the real reason that the flight did not continue on to Somalia?