I really doubt ins companies,the PGC or anybody else stocked yotes.Although if DCNR did it I wouldn't be surprised.
I think they took hold in PA expanded and here they are.The buggers are very smart and hard to kill so naturally the population will grow.As long as there's food.
One thing I have noticed about the yotes.My land was previous strippings and great rabbit habitat and used to have loads of rabbits.Then we started seeing and hearing coyotes.Guess what?No more rabbits.