We do need to get ourselves out of the mindset that you need to blow over .08% to be impaired. Even if pills and marijuana weren't a thing, you could still be considered impaired if you blew under .08% but failed the other tests. I would think that is a pretty rare occurrence but honestly have no idea.
I'm not watching a 25 minute video, how did the kid do on the impairment tests? I'm assuming he wasn't otherwise visibly impaired (slurring words, unable to stand still, etc) since nobody has brought that up.
It sounds like he should have a pretty good case if it even gets to court
OTOH most of those field sobriety tests are garbage anyway and would make most sober people look guilty.