As I pointed out in another thread Andy has not dived most of these, indeed he probably has never been physically in the same building as some. This is not like a dive magazine taking them diving to see how it goes. This is almost like blokes in the pub discussing the pros and cons of F1 cars. Regurgitated knowledge based on the promo materials of the manufacturers.
Some I'm sure he'd never touch just based on algorithm alone. Basically proprietary (not fully understand, lacking the same level of research) bad. Buhlmann ZHL-16C good. For the ones he hasn't seen, I'm sure he's talked to technical divers who have. The guy is pretty thorough.
His website is there to build a brand to get him students. He has many articles like this on a variety of subjects. Mostly they are better than this one.
Sacre bleu! Sharing content to demonstrate that one's a SME as a marketing vehicle! Who would have thunk it?
After DAN and Rubicon, his website is arguably the largest collection of useful training information on the Internet. Of any instructor, likely the largest.
Lots of people who will never travel to the Philippines have benefited. I provide links to different articles to his website to my students and I doubt anyone I've taught so far will ever be his student, simply because none of them so far have expressed an interest in being a hardcore wreck diver.