Very well done video, and interesting!
I've never been interested in eating octopus, but I have seen them in Hood's Canal Washington while scuba diving.
I have also NOT seen them, because their ability to conceal themselves is incredible. On that same dive, my dive buddy and I found a big hole in a rock wall about 20 feet underwater and looked all over the inside of it with our dive lights. When we surfaced, my buddy said "Wow! What did you think of that big octopus in the back of that hole?" I had to admit I never recognized it, although it was less than 3 feet away.