Why has this user 97832123 been suspended?
I was suspended for the reason that T.. noted. I think that this (ab)use of moderator powers (namely to suppress comments critical of the moderation staff) is a massive conflict of interest. I hope that the moderators will refrain from such actions in the future or that the stackexchange overlords will remove their privileges.
There is another important issue here: Moderation on meta should in general be as unobtrusive as possible. People should not be suspended based on meta participation unless there is clear evidence of misconduct (spam, obscenity, insults, etc.). Moderators should only use their powers on meta to keep general order. Posts and comments should not be edited or deleted unless they are in violation of the rules. General meta rules should be the same for all SE2.0 sites.
Edit: I would like the moderators to respond to this and take responsibility for their actions, as well as give an indication of their future behavior. I think that the community is owed an explanation.
Moderators should recuse themselves from patrolling comments about the site moderation:
Nor should moderators attempt to take "revenge" for criticism by suspending the users who post criticism. In this case, a user with a clear understanding of the MO/mathematics/academic culture that is much more relevant to the future of math.SE, than (some) moderators' prior experience with Stackoverflow.
We prefer not to single out an individual user nor discuss private communications. The individual user is informed by email with regard to the nature of the problem. Depending on the situation, users are typically given multiple warnings and given the opportunity to correct the situation. Moderators are able to leave annotations to communicate to each other about past problems.
In general, it is a private matter between the moderators and that particular user. We leave it up to that user to discuss (or not discuss) what happened to them.
It is basically matter of respecting another users' privacy.
The text of the email that I would have sent, minus his real name:
During this time, your accounts will be locked at 1 reputation, your user pages will have a visual indication that you are in timed suspension, and you will be unable to ask or answer questions. At the end of this period, your reputation will be recalculated, and your accounts will resume as normal.
If you are unable or unwilling to write your posts in a non-inflammatory way, I suggest that you restrict yourself to posting mathematical content only in the future.
aka Kaestur Hakarl
Since the above doesn't provide much in the way of explanation, I will also say that I agree that this suspension would be overly harsh if the user were anyone else, but there have been many instances of 97832123 disrespecting and antagonizing other users in the past, and in general, his pattern of behavior is more consistent with that of an anonymous troublemaker than someone who has a real interest in bettering the site. He has also been warned and suspended on multiple prior occasions, which contributed to the length of this suspension.
If 97832123 is interested in contributing mathematically to math.stackexchange, then that's great. I'm sure that someone as talented as him can have a lot to add. Weighing in on the way the site is run through meta is welcome too. Just keep the comments about posts or ideas rather than about people, and follow the advice in the faq.