>To which my point was, so what? It doesn’t materially change the original claim you challenged. [...]

It changes the claim in the same way that "he ran over a kid" isn't "materially changed" by the addition of the detail that the kid jumped in front of the car and he had no time to stop. The original statement is still technically true, but it's a massive omission to leave the latter part out. That's doubly true if you're invoking that fact in the context of trying to imply the person did other crimes.