Yes. I didn't talk about it until I confirmed it. Someone who knows a lot of people in the YC-sphere also confirmed.
Karma scores of others' posts don't appear here, but they are available (on old posts) using https://www.hnsearch.com/ .
If you look at your placement of an old post (> 3 months) and find yourself at/near the bottom but have the highest-rated comment, then you're on rankban (rankban seems to apply to threads that originated before it was applied).
You can also check for slowban empirically by comparing latency while logged in to what you get in Incognito mode.
