>>12923326No. The 'only' reason Normal Arceus is used is for STAB on the Normal type move, Extreme Speed.
It's movepool is so diverse, it's not limited by items. The boost with LO isn't necessary when you can get a guaranteed boost and attack afterwards. Leftovers is handled by bulk + Recover. It's even one of the two viable users of Refresh.
Choice really isn't an option with its movepool.
Normal Arceus is used because of its Normal STAB. You're being needlessly nitpicky if you can't accept that Arceus-Normal should count.