There was no evidence to support the claim of overt political bias. The New York Times reported that some Facebook employees, who spoke on condition of anonymity, said that any “suppression” happened “based on perceived credibility—any articles judged by curators to be unreliable or poorly sourced, whether left-leaning or right-leaning, were avoided, though this was a personal judgment call.” In other words, sites that appeared to be spreading viral nonsense were deprecated from Trending, regardless of political leanings.
This part is so egregious. Especially since what we know now about how Facebook CEO Mark Zuckerberg virtually stopped all content moderation of hate speech in 2019 around the same time he was hosting dinner parties with conservative media personalities who were critical of the supposed "suppression of conservative voices."