I'm almost 100% certain that Thrall has a video specifically on improving squat mobility. Will have to have a look...
Edit - Here you go: https://www.youtube.com/watch?v=zvGr7wXQfwE
Ya I watched this before. Maybe I was looking at it wrong. Thought the phases were more of a test to see where I'm at as opposed to a way to improve flexibility. You think I should just replace weighted squats with these and stretches/mobility exercises until it improves? Is it alright if I still do other leg exercises during that time like extensions/curls or will that impede progress?