Scanning through it, the allegations I spotted are:

* He is flaky and often doesn't keep appointments. * One guy says he invited him to go camping but didn't turn up * Apparently he may have slightly misled his ex about where he lived in private messages * His ex says that he has anger (purely verbal) issues * Some other people all say he has anger issues * Some incredibly spurious allegations that he had an affair

I probably missed some. But notably, almost nowhere is there any attempt to tell Huberman's side or have any empathy for him as a human being. Hence, it's a hit piece.