Earlier quoted context omitted.
I hope that this doesn't also mean that running a Tor exit node puts you at risk of getting banned (from HN or elsewhere). I think the people running exit nodes are providing an essential community service, and I would hate to think this might be how they're thanked.
Wikipedia bans your IP from editing if you run a Tor node. It definitely biases their content and discourages operation of Tor nodes.
Wikipedia bans Tor editors because editors who use Tor are overwhelmingly doing so to avoid bans. I'm sure there are a subset of Tor editors who are good-faith contributors, but, just like with HN, a bad-faith majority has ruined it for them.