His response was impressive I agree, he has matured. You can see that from his initial response to the Bush quote (claiming his memory is infallible, and then condescendingly talking about "absence of evidence is not evidence of absence" when the burden of proof is on HIM) vs. his comment where he said he'd made "inexcusable errors"

Full disclosure I'm not American so my main exposure to this guy is his tweets and occasional Reddit threads about how much they hate him.