It's the ultimate unlockable (that wasn't marketed) in a remake of a classic, and this was already argued in a previous thread that did the same thing.
Because it's an old game, and still quite recently released, one might consider that some would be hoping for there to be a cool surprise for getting collectibles instead of just a trophy...
yes, Might be a cool surprise. knowing the existence of the game doesn't ruin the experience in any meaningful way for the vast majority of people.