If you watch the interview, he says he can’t do that for extended time because he can’t sit in the chair for that long without getting sore spots, and he has body spasms which put him out of place which would require someone else to put him back into a playable spot.

He can do this with neuralink in his bed, despite the spasms that change his position.

Edit: that one might be different though, the tongue one he has is part of his chair