In September of last year, Politifact ruled a claim made by a guest on Tucker Carlson’s show on Fox News as totally false, labeling it a “debunked conspiracy theory”:

In a Sept. 15 interview, the most-watched program on cable network television aired a conspiracy theory that has been debunked since the beginning of the coronavirus pandemic.

“Give us, for a non-scientific audience, a summary of why you believe this virus came from a lab in Wuhan,” said Fox News host Tucker Carlson during his self-titled primetime show.

Dr. Li-Meng Yan wasted no time.

“I can present solid scientific evidence to our audience that this virus, COVID-19 SARS-CoV-2 virus, actually is not from nature,” she said. “It is a man-made virus created in the lab.”

That “fact-check” has evolved, as spotted by the New York Post’s op-ed page editor:

And now this is at the top of the page:

When this fact-check was first published in September 2020, PolitiFact’s sources included researchers who asserted the SARS-CoV-2 virus could not have been manipulated. That assertion is now more widely disputed. For that reason, we are removing this fact-check from our database pending a more thorough review. Currently, we consider the claim to be unsupported by evidence and in dispute.

Well, at least they updated it.

Sometimes even less than a grain of salt.