from what i remember, it was not his job -- he worked on products that have usb-c components (like the pixel laptops) and wanted to make sure the products on amazon were up to spec. you can see his reasoning here: https://plus.google.com/+BensonLeung/posts/LH4PPgVrKVN
Definitely not, I would buy cables that had already been reviewed by a very thorough user like him! But this guy has made it a hobby to buy different USB 3 cables and try them out. If I was doing that, I would have made a continuity check test rig to measure point to point and also measure the pullups that he usually ends up measuring by hand.