That’s a reference to the early Covid 19 investigations/reporting.
People always bring this up as if there is some collective responsibility for they themselves having believed an obviously politically motivated narrative. Like personally I'd just take some responsibility, admit I was suckered, and try to do better in the future. But rather with the context of how it's brought up, it's clear they're just still at it buying into new nonsense political narratives. "Can't get fooled again"
Ooooh, got it.