I don't know that the article was all that badly written, but you missed a couple of points that I'd call essential:
One, it was 32 students out of 35 total who used AI and then didn't even bother to check it, so only 3 students even made an honest attempt in the entire semester.
Two, the professor told the students that they were allowed to contest the grade if they wanted, and only 2 out of the 32 students even tried to contest it.