well, my dead and squat are only 385/315 respectively, but i’ll throw my hat in the table if you’d like.
dead - need more leg drive, hipe rise too fast. back needs to be arched harder.
squat - i’d personally have a narrower grip to create a better shelf in the traps, it’s my understanding that wider grips are only necessary with significantly larger and more inflexible lifters. the kid takes a lot of time to get set up under the bar after unracking, that should be worked on. also, from this angle it’s impossible to tell if the lower back rounds or not, but if this is a true low bar squat, i’m thinking it must be rounding at the bottom. I’m all for low squats, but with low bar it’s very hard to get very far below parallel.
hope there’s a little something there. i’m sure some more experienced guys would have more to say or correct what i just said.