I mentioned in an earlier answer that question was altered to fit the answers and then closed (which I believe happened in June 2021).
However, since then the post was chosen to be deleted (I believe this occurred at the end of December, 2021).
But is that implicit in the flag
Not directly, but a Not An Answer flag puts it in the Low Quality Posts review queue, and users there will be invited to leave a comment. They can even choose from standard ones ('canned comments'):
That said, I often leave a comment as well. The user script AutoReviewComments - Pro-forma comments for SE helps me because it'...