In my experience, yes it is. Though from what I’ve seen, it seems that upper hamstring soreness is worse when people first start going deep, then it goes back to being mere regular soreness :). I also get quite sore 2 and 3 days after after doing high volume squats, though a warmup will make it go away for while before returning later in the day. Low volume/high weight doesn’t bother me.
I haven’t had a chance to watch your video yet due to being on a funny computer atm; I’ll look at it later today when I’m at the gym.