As for your form, it looks like you're losing your weight forward. Your heels raise off the ground on every rep. It also looks like the lateral (outer) aspect of your feet also comes off the ground at the bottom of the squat. When you're descending feel the three points of contact of the bottom of your feet on the ground. Put equal weight on all three and really "cement" your feet in that equal weight position and focus on maintaining it throughout the entirety of the squat, especially at the bottom. You're looking to keep the weight over mid-foot for the entire set.
Also, really, man, you are going to need to gain some weight, like, yesterday. You've come to the right place, and you're on the right track with asking for help, but at 6'2", 153 is just way too light. Good luck!
I thought they were high too, but if you pause the video while he is at the bottom of the squat, he certainly looks to be hitting proper depth.