I went to the "learn more" link, read the article, and was not enlightened thereby.
I added this comment to it: "This article was linked from my suspension notice by way of explanation of why my account has been suspended — but I didn't violate any of these rules, to the best of my knowledge, so the notice needs to be more specific."
I followed the "Learn more" link, read as carefully as I could... and remain unenlightened as to what the problem was. The key points — the "don't"s — seem to be these:
Aside from the vague hint in the notice itself — "If you have concerns about community moderation, including why your content was reported or removed, do not post about it in the main newsfeed." — I have no idea why I've been suspended.
So I don't actually know what I was suspended for. I may have to try some tests.
If it is about discussing moderation in a public thread, though: users need to be able to talk about moderation openly, in order to prevent bullying and disinformation-spreading by people who know how to do it without breaking the rules... and ND needs to be clear about which venues are acceptable for discussion (the guidelines as I understand them only say not to discuss it on the main newsfeed, which I did not).
There have been similar problems with posts and comments (not just mine!) being removed -- there's never any explanation given at the time as to what the problem was. Sometimes emailing ND Support will evoke some information, but too often these inquiries are left unresponded.