All games ended up needing a GPU and a soundcard - in fact they became so necessary that all CPUs and motherboards today come with a GPU and a soundcard respectively. While VR headsets were a gimmick of the moment.
(Yes I know some CPUs come with no GPU but that's because you will buy a discrete GPU which only furthers my point)
If I released a game on PC that required a peripheral, like a racing wheel, does that make it not a PC game?
In the 90s you might have needed to buy a graphics card or sound card to play a game, but it was still a PC game.