I would say that reading about the fact checks of the Wuhan lab leak theory during the pandemic were a pretty good example of this, where just because something might likely be of "natural origin" doesn't mean that it didn't escape from a lab.

So they would criticize someone who said it leaked out of a lab with evidence that suggested that the virus wasn't man made. However, that evidence doesn't really have much to do with:

1. Could a virus of natural origin escaped from a virus lab unmodified? 2. Could a lab that was engaged in research trying to modify a virus have accidentally let the virus escape and the research was the actual source of the virus?

To be fair, I personally don't think anyone can say for sure what really happened, but by manipulating the scope of the question to a very narrow man made virus escaped from a lab when the original speaker just said it leaked from a lab, your claim can easily be labeled as false.