From what I can see, he's a talented lecturer. He's articulate, genuinely interested in his students' understanding, and has some uninhibited dramatic enthusiasm that keeps the audience engaged.
He's doing a start-up centred on teaching skills for lecturers/professors; I wonder if behind the scenes the issue is simply about that?
Not sure how this particular argument will play out (yikes, it's quite public now though) but he's a smart chap and should land on his feet.