I see what you are getting at. However then we are discussing what constitutes an update to a previous fact check from years ago.
That claim was still false when made in August 2020, and making that claim at that time still remains false as it was unproven and up for debate (as Politifact pointed out) at that time. A correction would surely only apply if it were found to have been wrong to call it false at that time and before it was proven to be "perfectly legal" (which I would contend it still isnt. Not "perfectly" at any rate- he got given the benefit of the doubt with a literal interpretation by the judge , who himself said it was unclear).
Just to clarify, I came into this by disputing the assertion by a poster that politifact " got it completely wrong", which just simply isn't true.
It is completely wrong now, it was dubious back then, they could have pointed out that it was disputed etc.. expressed uncertainty about it, they even acknowledged that there were exceptions to the rules but then dismissed them with some vague handwaving about hunting.
They have a meter on the site where they try to show how false something is, in this case they put it all the way over to the left:
Yet it was clearly disputed and there were good arguments that it was indeed perfectly legal (and which turned out to be quite correct), they have obvious bias and so placed all the weight on the argument they preferred, despite it being the far weaker argument given what the law actually stated. not updating after it was indeed shown to be perfectly legal in court too was silly, doesn't exactly do much for their rep.