I didn’t read the article, so I don’t know his rationale...but I also wonder what his thoughts are on the evil magical ones, and the good magical ones in Narnia.
Yes, a thumbs up on the positive ones like Narnia, because of the Christian symbolism (so there’s a good vs. evil theme), something lacking in Potter ...
If you’d read the article then you would have the answers to your questions, because he addresses these very concerns.