Winderbaum on Demayo:
"I can't talk about the details," Winderbaum tells EW in an interview, "but I can say that Beau had real respect and passion for these characters and wrote what I think are excellent scripts that really the rest of the team were able to draw inspiration from [to] build this amazing show that's on screen.
Asked if he would categorize the parting of ways as a firing, he says, "I don't. 'We parted ways' is the best way I could say."
https://ew.com/x-men-97-beau-demayo-firing-marvel-animation-responds-8609643
This does sound a lot more diplomatic than if he were about to face, say, criminal allegations or something. sounds more like he was just difficult to work with.