Nice video. He didn't talk about breathing much or leg/foot position and leg drive, but overall pretty good IMO.
Getting a slingshot or RAM is more than just protecting your shoulders. It's about working and improving your lockout by overloading. I do agree, that you should use good form on all lifts, all the time. Unfortunately when we get to the last couple of reps on heavy days, that form my go to shit. That's when the RAM/slingshot will keep you safe.
"I can't wait 'til tomorrow, 'cause I get stronger every day!"