I did not say HE was dumb; I said "the ability to tie a bowline with one hand while wearing a 3-finger mitten" was dumb as a requirement for OW students.
Do you know why he does it? Do you know that his students are undergraduate and graduate students at a major oceanography institution and dive in very cold waters around the world? His "OW" course is a semester long that includes 12 dives. He makes his students do lots of things that help them become very capable scientific divers.
I dove and worked with this course graduates, they are some of the best divers graduating from an entry level dive course I have seen anywhere. Too bad that he retired.