The Nodevember statement seems reasonable on its face:
"[...] his presence would make some speakers uncomfortable to the point where they refused to attend or speak.
We reacted to this feedback. Nothing else. Any other speculation around his past behavior was not taken into account.
This conference was started by a group of friends to gather around the love of a shared language and community.
We are in over our heads. The conference has grown to something we never anticipated. We aren't professional organizers or PR people. We are still learning, and will make mistakes. We don't do this as a full time job. We do this because we love the community."
OK, they're just a group of friends doing their thing, and it's their club, their rules.
On the other hand: they're charging $350 a ticket, so can hardly be complete amateurs. It sounds like they're trying to downplay any political angle, when excluding such a speaker would inevitably be seen as a political move in the current climate.
(Conference for an extremely hip, progressive community (Node) excludes old-school elitist greybeard. Only reasons cited publicly are mildly condescending remarks in Crawford's public talks and unelaborated backchannel complaints).
So, though I don't know enough and so withhold firm judgement, it does appear that the Nodevember organisers thought they could deliver a public slap to Crockford by ostracising him, proving some political point, and are now downplaying their own behaviour to avoid the PR backlash.
Either way, it is their club, their rules. The real solution to this is for those closer to Crockford's philosophy of life to assert their right to free association, and host an elitist conference for Real Programmers where noobs are flamed, idiocy is excluded, truth and justice reigns supreme, etc.
Edit: I've just seen this https://twitter.com/nexxylove/status/771503661956501504 which makes it look as though the Nodevember organisers were bullied into excluding Crockford to deflect a PR s...storm about their insufficiently diverse keynote speakers.