An RF shield?Actually, there is a metal layer between the pad and the second board on top.
I don't see why it should have increased. I'd say it's lucky that it didn't decrease.So, the 2 pads ARE thermal pad. The guy who open it even added some thermal paste to touch the processor also as Canon did not.
It's a very weird choice indeed.
The worst is that the recording time did not increase despite a actual thermal measurement completely acceptable for any electronic component.
...has better understanding of thermal management of their cameras than some random "Chinese engineers".The most acceptable explanation is that Canon