That’s a different technique.
At first I thought that my SBD sleeves didn’t add anything to my squat, but not wanting to wear them out I only used them for meet prep and the meet itself and did most of my training with a pair of Rehbands that definitely don’t add anything. They are stretched out a bit and can slide down my knee on their own until I start sweating. Anyway, at some point I was training for a particular meet but didn’t go because it was out of town and I had other things to deal with at that time. I spent a month or two training in my SBDs and when I switched back to the Rehbands I was slightly weaker. A weight that I could get 5 reps with previously I could now only get 4 reps. The next week I put the sleeves back on and was able to match or surpass my previous rep PRs.
I attribute the carryover from the sleeves (which I didn’t seem to get at first) to changing my squat technique, I now use a more quad-dominant style with more knee flexion. Obviously bending your knees more is going to put more tension on the knee sleeves. But still, I’m probably getting about 10 lbs. out of them, if they were ridiculously tight then maybe 25lbs. but definitely not the kind of weight you are talking about.
If you are interested in getting carryover from “raw gear”, look into the Titan Triumph singlet. It has a double layered crotch and can supposedly add a decent amount to your squat, especially if you get a real tight size. Also, Titan makes Yellow Jacket knee sleeves which are similar to the SBDs except that they aren’t tapered, which will make it easier to put on if you have big calves. I haven’t tried either of them, I just thought it would be worth sharing considering the topic we have here.
What knee sleeves do you wear anyway?