Must-know for disassembly: unlike the MateBook X, there are no screws under the rubber feet. Instead, there are many plastic tabs that hold the back plate firm. Unscrew the screws and use a guitar pick or similar tool to pry around the edges until all the plastic tabs are undone. Then, the cover will come off.
The only heatsink in this laptop is this big metal plate. The tiny fan simply blows air across it instead of pushing air through heatsink fins. The heat pipes extend all across but they don’t lead anywhere. They just spread the heat evenly within the laptop. Therefore, sustained-load performance takes a hit.