I never actually looked into the Thun sample, but listening to it now I don't know if that's what the problem is.
First off, of course Hitboy got the sample from some royalty free music thing called "Free Music Egypt."
It doesn't seem like he did
too much time stretching, because if you play the video at 1.25x speed it's pretty similar to Thun already. He probably tried to filter out the little bright sounds speckled throughout and ended up shaving off the top end. He probably poured all the reverb on to it trying to hide how janky it sounded afterwards.
Death Row East doesn't seem like it was super pitch shifted/time stretched either. I think he's just going overboard using a bit crusher, or something like RC-20, to add a "vintage" texture to the samples. I don't really have a problem with that, but it does stick out a lot when he blends clean and sharp synths and/or tinny drums with the stomped on middy samples.
I filter, bit crush, time stretch and pitch shift the shyt out of samples and I can usually clean it up better than he did, and when I can't I lean into the texture and build around it. I'll put a bit crusher on my master track just to get everything to meld better sometimes. It's not something that makes or breaks a beat IMO. Pete Rock stomps the shyt out of his samples and it's part of his signature sound. I think it's just how he decided to use it. I think it's fair to say the sound texture and coloring on his production is just not great,
I agree, like I said I love the song, but it's Nas and the violin sample doing most of the heavy lifting. If a better producer remade the beat it would be 10x better than what it is.