Remind us, do you have an instructor rating?
I don't believe he does, but he's still correct.
I'm an instructor, and I agree with his comments. Is that close enough?
It is possible to know something about aviation without being an instructor.
That is absolutely 100% correct.
The difference between the instructor and the non-instructor is that the instructor can lend his signature to incorrect information. Instructing isn't about other-worldly pilot skills, and it isn't about having an unusual compendium of knowledge. It's about being able to present material, recognize common student errors (and correct them), and to explain in a way that's understood.