I think it's legit, as he's posting similar stuff that's on his IG. Also his Twitter likes are pretty similar stuff to what he likes on his MaskedBodybuilder account. Which is a bit silly IMO, surely you'd keep that on your porn account and have regular likes on your official account?
Can't remember if it was mentioned on here or the other MuscleBullx thread, but his missus is totally aware of his OF account. She appears (hidden face obvs) in a few of his videos, including the new one today.
I certainly don't think he's hiding to her what he's in to.