My Dell Ultrasharp 4K also doesn't flicker and has DSC enabled according to the on screen menu. At work there are a few old Iiyama 4K screens that flicker though, but I don't know if they even understand DSC.
I've got a 4K Samsung Odyssey that I have come to hate because of it's extreme slowness and weird behaviour (I do not recommend this line), but I haven't had any problems with flickering with either M1s or M3s.