Your comment was killed by a software filter that is based on past abuses by spammers and trolls. But moderators review the comments that were killed that way, and unkill the good ones (like yours, https://news.ycombinator.com/item?id=20952659). So this filter is mostly just a delay mechanism.

Users also often restore the comments to visibility before moderators get to them, by vouching for them. (To vouch for a dead comment, click on its timestamp, then click 'vouch' at the top of its page. There's a small karma threshold (> 30) before vouch links appear.)