It will depend on where he works, true that if his designation is changed government auditors may indeed come looking for all his credentials. Even if his salary is huge for his designation, they will dig. Akso if the designation change is only on the contract, or if it is on his visa.

Needs way more details.
_____________________________________________________
"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"