3.5 at best!
It would be better to see actual match play. He's going high risk and mostly making it in this video. I'd like to see how he hits during a real match, as I don't think he'd be quite as loose and aggressive in match play. I'm not necessarily against low net clearance, but there's a lot of net skimming going on here.
I thought he looked short, but maybe that other guy is very tall, and then I can read between the lines and see the guy is a junior. Hopefully, he'll grow a little taller. How's he doing in the Junior rankings?