I don't think anyone is intimating that he can't sharpen things but it appears from reports that razors are not one of those things. It is difficult to be an expert in all aspects of sharpening different things.
The other thing is that a company that is supplying a service by putting out instructional videos should try and not make it a disservice.
I have the vid bookmarked and when I have a hour that I can afford to never get back just may try watching it.
Bob