I think you are mischaracterizing it. He said the guys says his disability prevents him from typing even though he tweets all day. Not saying Musk is correct here, but he didn't say what you are implying.

we all know you are right. even the people that will tell you the contrary. and we all know that if it was Biden saying that rather than Elon that will be on page 10 of google search and in 0 newspaper . this is how it works now. once you are filed as bad by the media there's no way back.

How does reconcile that against Halli clearly tweeting a lot? If he can type to tweet, surely he can type to work? And if he can't type to work, and his job requires typing, why would he stayed employed?

I know someone who can literally only move her eyes and her neck a little, and she still manages to use software to type.