One thing I want to close the book on forever. How much if any lumbar extension (called it flexion by accident in the video) should there be on either movement? I have been progressing up using no lumbar extension in my lifts. Just hip hinge and mantaining core tightness.
Flexion is where you tuck your pelvis in, extension is where you stick your butt out like Donald duck.
Either way, I can’t see anything terribly wrong with your squat. Nit picking won’t help you much in my opinion, your basic technique is on point and as the weight gets to a stage where it’s actually heavy for you then you can start to see technical breakdown. Heavier weight will probably also force you to stay tighter throughout the movement, which is the only criticism I would have.
Just to repeat electro barbell, that’s correct. You should hold your spine in normal anatomical position and brace it there for the duration of the movement.
Having said that, you appear to be losing some tightness and falling forward out of the hole.
It’s not a great angle to view the squat from, but all of these look high.
I would want to see you bring your knees farther forward, sooner, and drop down into the hole another 2-3 inches while keeping the weight mid foot and your knees out. I think your squats will actually feel better if you sink deeper and stay tight.