The problem with this sort of thing is that I remember in the 2016 campaign how Trump would go on record saying Highly Objectionable Thing. You’d have the New York Times and such crow that now they’ve got him, print the statement. Trump wouldn’t miss a beat, would just go and say something in complete conflict with the other thing. He didn’t bother trying to reconcile the statements.
I don’t think that that statement’s going to do him any favors, but Trump has said a lot of things on the campaign trail that, if taken at face value, would probably kill his chances as a serious candidate. That didn’t happen in the past. I’m skeptical that it will now.