They mislabeled the game as a PS2 one, though. Unless that's just referring to what it's going to be played on?
The best setup to speedrun DtP is to play the Namcollection version of the game on a PS2, so yea that is intentional.
Namcollection is a Japanese exclusive game cartridge containing its own version of DtP along with 6 other Namco games.
Its speedrunning differences when compared to any other versions of DtP makes it the best version to run on. Namely, better loading times, and one specific skip made a bit easier.