Transfarring, son.Think about it, that listing implies a shared trophy list amongst Vita and PS3. Only games to have shared trophy lists are Cross Buy. MGR is already out. There's no Vita version, so Cross Buy's not possible. A late port would likely have additional content to make up for its' lateness, thus no shared trophy list.
This happened to that Senran Kagura game, where a PS3 icon came up in the trophy list when that game is (for now, I guess) a Vita exclusive.