Seems reasonable: Though he is exaggerating the dynamic movements “somewhat” ..
Still, one does wonder why a “simple” Medieval archer needed needed so long to practice and become proficient, if all he needed to do was stand in one place and volley arrows randomly at incoming knights and pikemen?
It’s certainly possible that he doesn’t have it quite right, but that’s because he’s self-taught using the information contained in medieval and ancient drawings.
He’s trying to relearn what was lost.