Ah ok I see it now. Yesterday when I was on her twitter I did not see those comments; only posts from when she was at the show in Japanese.
Well he must've played it early on then. When he was behind that blue orb. Usually opening warm up set isn't so chaotic as far as the energy goes so it might be telling that if he did play it early on, it would be a soothing, warm trance track. Although, I can't imagine Ayu arriving early enough to catch it. Lol. Then again, it does look pretty light out yet in the photo that she posted outside the arena.
It's quite possible he could've played the dub version without her vocals even. Out of the videos I've watched, these are the only songs I didn't recognize.
Beginning at 2:10 onward