That method does work for some people, and it might work for your son, but I wouldn't put all my eggs in that particular basket unless I knew my video was going to show tools that are sure to get attention.
A player who is, as you say, "on the ever popular bubble between D3 and lower level D1" knows up front that there are a lot of players of his approximate skill level, so his video is not likely to go viral within the recruiting community.
My advice? Go ahead and do a video, but continue to execute, evaluate, and adjust the plan you already have.