Is he going to persuade someone who does not have TDS to get it? No way. He's way too over the top for that.
But may he persuade some other people with TDS to oppose wokery? And does the fact that he has severe TDS give him more credibility to do that? Yes.
So on net balance, he's a force for the good.
Maybe it's just the petty, adolescent part of my own personality, which might make me a bit of a hypocrite, but I get a visceral, cathartic pleasure from seeing people like Harris publicly humiliated. I don't want to keep him around to use as a recruiting tool. Frankly, even the rational side of me thinks he'd be more effective at that when he's reduced to a sputtering, stuttering, incoherent shambles, clinging desperately to his hagiographic self-image even as he's forced to acknowledge how wrong and stupid he is.
Eh, you assume that it will end his career. It won't. So it's basically a win-win. He showed the id of the ruling class, while also gaining credibility with the ultra-left crazies, which he could leverage to persuade them of something actually good.