I don't like it, but I'm a grouchy old guy. In my book, if you make a commitment to a team, you should follow it through. sure, there is always the risk of injury if he plays out the HS season.
from the above video, his team was 2-2 when he made his decision. I think California plays a 9-game regular season followed by playoffs, so he played less than half of the regular season. his team was 8-5 last year, so must have made a playoff run.
note - was trying to find out more about the California HS playoff system - apparently there are 14 divisions. based on what I read, it's a fairly complicated setup.