This angle is not great and it would be good to see what your stance and bar position look like. But from here I can tell you need to have a slower,...
You do seem to want to lean back a little too much at the top, correct. But the main thing here is that you need to commit to doing what is written....
I would bug people and get the rear 45 angle next time. From here I can tell your hips are breaking before your knees and they need to start bending...
Please film so we can see your whole body - and a little in front of the bar so we can see stance/grip etc. But from this angle I can still tell you...