Can this collection be removed from Census? It doesn't appear to be an in-game collection and it seems to be tied to the meta collection "More Sights and Sounds" in Census and it is actually NOT tied to this collection in game.
Correct. And it is listed in census because the collections were all input to census well before the expac was finalized. (Hell, IIRC, it was well before beta even announced - it was how we unofficially found out the name of the expac, IIRC, lol)