I'm thinking that is the basis for the talk, but I can't think that going AWOL for a few hours would somehow be grounds for any suspension. He could get a talking to, but I don't think the league could do anything more than that. If he's showing up for and passing his tests, he's meeting the standards to avoid suspension.
I'm willing to bet that the original Twitter idiot (who I won't give the satisfaction of a mention) caught wind of his going missing and ran with that. It's telling that the guy would have absolutely nothing further to say about a mention that he knows has gotten a lot of coverage.
He's a known scumbag whose own career is failing so I have no doubts that he has no integrity and would throw anything out there in an attempt at a "scoop".