> Your point would be much stronger with evidence, if only to calibrate everyone's understanding of what you mean by "left content".

I think it's extremely likely that people will see the "de-ranking" of content they agree with as bias, regardless of their place on the spectrum.

Similar: "Biden must have committed election fraud, because all of my friends voted for Trump and I don't know anyone who voted for Biden." (previous election, obviously) Well, is that because no-one voted for Biden, or that the friends/content you see is tuned to how you lean.