FAA has no jurisdiction on the crew rest requirements for foreign carriers.
I wish it was not true, but it is....
Secondly, a 24 hour layover is not illegal... although I too wish that was.
Lastly, I think the FAA visit here will sadly be just for show and nothing else.... kinda like when the Red Cross comes to visit prisoners in the POW camps and the prisoners say nothing out of fear for what will happen when the Red Cross (FAA) leaves the premises.
K