I consider myself extra critical of receivers as a HS WR coach, but with the level of difficulty of that catch with that defensive play, I can't really agree with you, and trust me, if you saw all my critiques of WR technique last year, I am not one to really give a lot of room for error on the WR side, but Tanners technique on that was really about as good as you can ask for in game speed.
I think your angst with technique is better spent on Hifo.