Btw, it's better to let us know at hn@ycombinator.com about cases like this so we can be sure to fix them. I only saw this randomly. We're grateful when users watch out for each other and we're always happy to unban accounts when it's clear that they're using HN as intended.
(Detached from https://news.ycombinator.com/item?id=29200985)
You've been talking into a void.
Unfortunately, this also means we have to make guesses when there isn't much information to go on, and that leads to false positives. Your account looks like one of those, since it went on to participate on HN in a good way. I'm sorry about that—we always correct these situations when we see them, but sometimes it takes time before we see them.
I've unbanned the account now, so everything should be fixed. If you need anything else, email us at hn@ycombinator.com.