The reason many people oppose it is because it often leads to completely innocent people being harassed and/or ostracized (or worse). So, in that way, his situation makes a very fitting example of many of the things wrong with cancel culture and highlights a few of the reasons why detractors oppose this kind of attack.
Secondly, it's unfortunate that, despite buying into cancel culture and believing it is merely "facing consequences", he doesn't mention any names. If I were in favor of this kind of social retribution, I definitely would think that the members of this committee should "face consequences". At the very least, they should be removed from the committee, as clearly these people shouldn't have the authority to enforce any CoC, let alone a particularly nebulous one.
All in all, though, I feel very bad for him and, if nothing else, hopefully this doesn't bring him any more trouble.