Yes, this person may not be sincere. But we know there were a lot of Obama to Trump swing voters in 2016. Maybe that author doesn't fit in that camp, but a lot of people do. (What drove them to Trump, by the way, had nothing to do with where on the political spectrum you think Hillary Clinton fell. It was just that it was Hillary Clinton.) Those voters can be brought back and, in many places, account for the margin of victory. Nevermind the possible hardcore Republicans you might be able to flip who can't see Trump as an actual Republican. I wouldn't count on them right now, but I wouldn't count them out either.