Squats look ok to me
Your deadlift could use a little work tho.
First off get rid of the trainers, they’re horrible for lifting. You can pick up a pair of wresting shoes for pretty cheap and they are great for a cheap, flat shoe.
Secondly if you’re actually interested in powerlifting(why I’m assuming you’re here) then invest in a belt. Go get one thats leather, uniform 4" around, and 13mm. It’ll help keep your back straight and you’ll be using it in competition so why not use it in training. Some say they prefer a thinner belt for deadlifting but I’ve never heard of it being an issue while pulling sumo.
I’d agree that your stance looks narrow in that vid, is that the case? And if so why?
And I’ll throw in something that I’ve recently started doing that has helped my hips get lower off the start and get me more drive off the ground. I start out gripping the bar in a sort of stiff leg sumo position and as I start to pull I quickly rock back and down onto my heels and into my start position. Then its all about spreading the floor and driving it up. On lighter sets (225 and lower) I know I’m doing it right because the bar will actually start to come off the ground. I hope that makes sense.