I don't know how the guy rates knives, or what his ratings are. Really, to me they do not particularly matter, because the things that matter to him do not show up in my considerations.
The value I do derive is being able to, at times, see the knife in action. Also, I will watch the first part of a video, and see the knife's original sharpness, and how the ergos appear to be. I did watch the BK-9 test up through the part where he started breaking concrete blocks.
If the knife did it once, it is impressive. If the knife failed, it is not a problem with the knife, it is a problem with the tool for the application. Really, I don't expect concrete cutting performance with a knife, and if it does manage to acheive that, is most likely compromising in other areas. Really, a cold chisel cuts concrete all day long, but that doesn't mean that I want it for a knife.
If the guy wants to keep breaking knives, that is entirely up to him. Whether there is a value to it is really up to each person to figure out.