Is the experiment really over when politically-adjacent threads are still getting flagbombed and removed? Just because it's not in the site guidelines doesn't mean it's not being actively enforced.
Yes; that was happening before the experiment, too. Most general political news has been officially OT on HN long before the experiment, and remains so under the general guidelines. The experiment was effectively a ban on that small subset of political content that would otherwise be generally within the guidelines.
Some political threads get flagged and others don't. There was a thread about austerity and Nazis a couple days ago.
If you're looking for a blanket rule ("all politics" or "no politics"), we don't have those.