That's not how specific beats general works, though. A failure to say it is specifically for NPCs is NOT the same as creating a specific exception to the general rule and allowing it to work on PCs.
page 7 of the PHB
"That said, many racial traits, class features, spells, magic items, monster abilities, and other game elements break the general rules in some way, creating an exception to how the rest of the game works. Remember this: If a specific rule contradicts a general rule, the specific rule wins."
There is no exception being made by a specific contradiction.