I'm gonna add my 2 cents into this conversation. I actually really appreciate that this was handled publicly because this was an unknown issue for some/most and with it being handled how it was, a post was made talking about the issue and warning users not to do it in the future. It also educates others on the issue which is important. Stuff did get out of hand but I feel that the moderation team did a good job in not instigating anything and only took action where it was needed.
Mavis did get included because the discussion was about her. She got deadnamed and had a right to join and see what was going on.
Regardless I think how the moderators handled the situation was quite well, with it being public people know to follow the rule now and why it is such an issue. It's a moderator's job to make sure this community is safe and welcoming for everyone, regardless if you believe in it or not, they did their job by protecting Mavis and all other people who may get deadnamed.
In the future I hope they keep it up, I want this community to be a safe place for all and it's getting much better as time goes on.