Then why would she be trying to get people to take it down?
He's saying this because of that instrumental Infected Mushroom played at a set last year. That doesn't necessarily mean it wasn't for ARTPOP, he could have been playing the instrumental for fun at a show? AFAIK they never released it.
Except that mod from GGD confirmed it's a real song and confirmed the producers. Is it just a coincidence that she knew about Infected Mushrooms playing it a year ago and she listed them as a producer when nobody else even knew they existed? This guy just sounds like he's trying to get some attention or believes he knows more than he really does