See https://news.ycombinator.com/item?id=48721551 and let us know if you have any questions.

(aftbit already mentioned this link downthread but perhaps it's helpful to say this explicitly.)

Edit: actually I should probably pin that to the top. Done now. Sorry for the confusion!

It's a HN thing, not down to the commenter. Sometimes threads are reactivated if the mods think a low profile discussion is worth a second chance or boost. The submission time doesn't always reflect the original submission. Sometimes it's due to a comment move or thread merge.

PR companies have found that getting ahead of controversies is useful, so they invented time travel.