This is what he is talking about. It was already a censorship fight, 10 months ago.
This is actually overly generous to the r/Bitcoin side. The truth is they now rampantly edit, delete, and ban with absolutely no visible moderator record. r/Bitcoin might as well be a corporate sub locked to upvote-only.
Relevant: https://steemit.com/bitcoin/@lexiconical/seg-wit-is-a-trojan-horse-bitcoin-scaling-debate-explained