I’ve seen no evidence of this either. Recently made a comment on this as well:

Since apparently people still don’t know this, it is unlikely that reddit has been restoring deleted posts & comments. Historically, there was a limit to how much could appear on a user’s profile and even deleting stuff to back below the limit would not restore the visibility of items already pushed off.

They did relatively recently change this though so if you still have access to your account you can see and nuke the rest (although with the api lockdown and rate limiting shit nowadays it’s not as quick & simple).

Another reason this how idea got started was during the api fiasco, a fuckload of subs went private so anything in said subs did not show on profiles during that time. As mods capitulated or were removed, subs went public again and hidden content showed back up; people who nuked their accounts, via user profile pages, in this period assumed reddit was restoring their deleted stuff.