You gotta listen to the way people talk.
But it turns out it's just his likeness that forms the basis of the T-800 that's playable in Mortal Kombat 11. His dialogue will be provided by a sound-a-like - someone, I presume, who's really good at doing an Arnie impression.
The news was first reported by The Hollywood Reporter, which said publisher Warner Bros. confirmed it.
It's a shame real-life Arnie hasn't provided voice work for virtual T-800, but the main thing is Mortal Kombat 11 has his likeness - and based on the reveal trailer, the game's T-800 looks great.