Changing the motherboard fixed the issue for me, it's a faulty motherboard
So aside from the slow charger shenanigans I'm facing, the CPU temps are reaching 100, when on battery it's so bad that I can't Render a video or it'll auto turn off and won't turn on again until I plug the charger. When I plug it in I think it gives CPU failure 2 orange blink, like duhhh, it was overheating after all... Already repasted multiple times, doesn't change the fact that it's running crazy hot. At Idle it's running at 50-70 going up and down fast.  Dell Power Manager set to Ultra/Optimized still same result. Only when it's plugged in then I can render stuff without the laptop turning off. Tried the cool profile too, but unless the laptop's in folded mode, the fan won't ramp up, same with other thermal profiles, the fan ramps up exclusively when it's folded, is this normal?? BIOS and all the other drivers are already updated to latest with Dell assist, even downloaded some that are not there from support site with my machine tag. One thing I can't install is the...intel rapid storage thingy, says not supported dunno how to fix that. Already tried clean windows 10 re install, reinstall using dell os support to no avail...
XPS 15 9575 CPU running really hot