Also note that the fact checker errors are not random uncorrelated errors. Fact checks are performed through a political lens. The subconscious question is asked, how will this affect <policy agenda>? If something is factually correct but could lead to <bad outcome> then the fact checkers will consider that when choosing how to check the claim.
For instance, in the article that was censored was about faults in the study that convinced the CDC to support mask mandates in schools. The fact checkers read that as a claim that masking does not help limit transmission of SARS-CoV-2 in schools, which is not what the article was about.
On the contrary, it seems that the anti-vaxx misinformation is what's political. I've never seen such strong resentment of vaccines, public health policy and science in general until Republicans came out against vaccines in 2020 for political reasons.
Also note that the fact checker errors are not random uncorrelated errors. Fact checks are performed through a political lens. The subconscious question is asked, how will this affect <policy agenda>? If something is factually correct but could lead to <bad outcome> then the fact checkers will consider that when choosing how to check the claim.
For instance, in the article that was censored was about faults in the study that convinced the CDC to support mask mandates in schools. The fact checkers read that as a claim that masking does not help limit transmission of SARS-CoV-2 in schools, which is not what the article was about.