The end result is positive, so I'm strongly in favor of this.
Comments are small, hard to see, not highlighted well, etc. They're probably fine for the person asking the question and the few people trying to help, but they're nearly useless for the hundreds of people that find that question again later.
Answers should be in answers. Comments should be used to help improve things. If there's discussion in comments, it's best if the results of that discussion get moved into the question or answers. If the answer is hiding in comments, then it's best if somebody moves that into an answer post.
In this particular case, it would be better if direct quotes linked to the original comments, and that answer would probably read better if it was rewritten into something more "answer" style ("Here are some things to check for").