yup, it's a treble.
I can't comment on the most important aspect, which is the jazz end of things - I can't tell what's good and what's not, only what appeals or doesn't, which isn't the same thing
Recordery wise sure, he's quick, and his tonguing is neat and slick. He can tone bend, which is fun (not actually that hideously difficult on recorders, but very impressive when you hear it
). He's not using a huge range of notes most of the time, I don't like his tone much but then he's probably not looking for that good a sound - I'm guessing he's going for the rhythm and texture more?
For incredible speed and nimbleness, and lots of virtuosity, my money would still be on Piers Adams. But I've never heard him doing jazz...