If there was a consensus in this fandom, pro and non-Gillovny, it’s that Orlando Jones is professional troll. I find him funny, I know others find him disrespectful, but in the end, I think he’s just being silly and he says silly things in a way or another to see what kind of reactions he’ll get. And it works every time! I just think he’s been trolling one more time here, but he’s probably not Gillian or David‘s confidant anyway.
But because he isn’t a random fan, because he’s part of this industry, because he has a louder voice and because he wouldn’t disrespect a well known screenwriter, I think he wouldn’t say such a thing knowing Gillian is with someone else.
So it means 2 things : either he doesn’t know who she is with, and in this case he can’t know about Gillovny either, or he knows she’s not with PM.