I've had multiple college instructors who were absolutely brilliant at retaining information and ideas and absolutely atrocious at teaching it so this article is not encouraging at all as far as I am concerned.
Spine tilt? Clubface angle? Hand path? Who cares? Say I ask my instructor about all these things and he answers them correctly. How will I know he's utilizing any of it during my lessons? What people need is someone to tell them the dumb things they are doing and to be shown a better way. That's it.
Anyway, I tend to judge my instructors based on my results. I'm paying them to make me better at something, not to memorize books.
Okay then, just don't ask anybody anything. Just randomly select an instructor, and don't try at all to narrow it down at all.
To see YOUR results, you've gotta spend $300 or so on them. The article aims to help you choose a good instructor PRIOR to spending $300 (times five or six instructors).