He's talking about the PSTV, not the Vita itself. I understand his frustration, a game like Gradius Collection really should be playable on the PSTV. I would contact both Konami and Sony about this, maybe if enough people do, they'll fix it. I will do that myself, since I'd love to be able to play this on the PSTV.
But Chimpmeister just said it worked for him. Was he mistaken, or could it depend on whether or not the Vita is a slim maybe? Mine's a slim.
On a side note, did you get the game working on your Vita? It really shouldn't make a difference if you have the OLED or slim, either one will work the same.