It also passes the sniff test. Pick any of the largest subreddits from the list and look at its front page. r/funny, with 54m "readers", has multiple posts on its front page right now with less than a dozen comments. r/news has more activity on its posts, but still far, far less than 2019.
It's not like there's a thriving community on Reddit that makes subredditstats' numbers look wildly wrong.