I mean, if the corpse is still animated, it's not a corpse but, indeed, a zombie. And nah, it doesn't count toward the fetish. Necrophilia inheres to inanimated corpses - a key part of the necrophiliac power fantasy is that the body doesn't move, and you can play with it the way you like, moving it around like a doll, dressing/undressing it, carrying it around, etc.I mean I didn't think much of the game first either but once I played it, it was surprisingly fun. It's a good way to pass time as well as rub one out. But everyone has their own tastes and maybe not everyone will like it.
And just to clarify, aren't zombies animated corpses? Zombies that move around in games are generally depicted as a virus taking over a dead human body or some other kind of 3rd party force moving the dead body, but the body is still dead either way. Whether it's a moving corpse or a corpse that's not moving, a corpse is still a corpse. But if you prefer corpses that just remain still and dead like they are supposed to be then I can respect that.
But if it still walks on its own, resists, and/or plays a somewhat active part in the sexual act, then it being "technically dead" by lore is irrelevant.
That's like tagging "loli" a game or hentai with a 10-year-old character, except said character is depicted as being 1.7m tall, has an F cup, a huge ass, and just got a Ph.D. in astrophysics. At that point, for you to say: "hey, technically, she's only 10 by lore!" won't work, will it? It will just sound ridiculous and preposterous - like the "necro" tag on a zombie game.
Take note, you future necro-tagged game devs/posters.