Something always felt off about him.
Being quite involved in the Scala community myself, I can tell you that the impact of his technical contributions is basically zero. None of the projects he developed along the years has had any momentum (save for one, called "magnolia", which has a modest userbase).
He was giving more talks than anyone else in the community, solely based on vague ideas he couldn't even make happen. He was always bluffing somehow, presenting himself as some kind of grand architect pursuing grand ideas, while his effective impact was close to zero. He wanted to be perceived as someone influential, but simply didn't have the technical level for it, nor put the effort in.
I think he was tolerated just because he's been around since basically the language was created, and thus was friend with many people, and could tell stories about the early days of Scala.
With him (hopefully) going away, this will have no impact at all on the development of Scala or related projects, apart from saving slots at upcoming Scala conferences.