Reddit has, throughout the years, said that they don’t keep a revision history of comments, only the text from the most recent comment and flags like “deleted”, “edited”, “removed by mods” etc.

Of course, they could be lying, but a lot of these things were said before the recent drama and there’s no real reason to doubt.

I suppose one could go dig up the old open-sourced code from like 2017 and see how comments and posts were stored then, and hope in the intervening years they hadn’t altered it?