As far as I'm aware, our knowledge of the real-world facts haven't changed -- we're still in a position of great uncertainty. All that's changed is how various commentators are dealing with that uncertainty: they had been downplaying it, now they're acknowledging it.

https://quoteinvestigator.com/2010/05/09/groucho-principles/

If the story was “Trump points to Covid leaking from lab in China, evidence is a sparse” then ok cool.

But the story was “Lab leak conspiracy theory has been proven false but Trump continues to claim it’s true increasing Anti-Asian hate crimes”

Then Biden starts to comment on it and like a light switch the theory becomes credible, even “likely”. And all the newspapers act like they had been saying that all along.