We can't know what he's shooting at, but it really doesn't matter. Longbows with 110lb draws have been extensively tested against real armor. The basic result of that test is that an average longbow would have penetrated light armor well, but would have been largely stopped by heavier armor. Knowing that and mentally comparing the velocity on his shots to the sort of velocity you'd except from an arrow, it's pretty clear to me that there is no way he's going to penetrate realistic armor at any range to any significant degree. Getting 3/4" penetration on some non-fight quality twisted coat hangers and a thin unhardened leather cloth is pretty much meaningless. It's like kids that think "leather armor" means a kid skin jacket.
I'm not an experienced archer so I can't critique his technique. My knowledge is mostly "I'm a DM so I got to know this stuff", and "I've fired bows and crossbows a few times, and played lots of paintball (where velocities are comparable to archery)." He's at his best when he's saying things like, "Historical archers claimed they could do X, and they probably could." Had he stuck to a more academic discussion of his craft, I'd have nothing but good to say about him. Instead he has this whole crazy shtick. Byron Ferguson has a bit of a shtick too, but Ferguson has been doing this for decades and needs to self-promote because its what he does for a living. So far, this is just some guy on the internet.