The system has checks and balances to prevent such things from dominating discussion here. (Flags are part of that system; so are software bells and whistles; so are moderators). If we didn't have those, the front page would consist of nothing but sensational flamewars and endless towers of meta!
Sending it to page 2 when it's only 3 hours old and has more upvotes than almost everything on page 1 /and/ removing the [flagged] marker feels weirder to me than not doing anything, but eh.
Given the options I know of today for authors, if they’re still reading comments here, I’d recommend they replace the 2020 post with a redirect to the 2022 post, and include the 2020 post at the end of it fully intact. At least that would ensure the flamewars cycle on the complete conversation and not just half of it.
They don't have to be correct, they just need to provoke meaningful discourse, which for me means crowdsourcing the insights of hundreds of fellow devs.