Hmm, with the mod actually only the back reach 50, other parts of camera not reach that high.It is not his opinion... It is based off of at the very least the ECMA-287 Standard. I believe that Europe has adopted even stricter standards for electronics and wearables.
Anything that is continuously held by a non skilled person should be limited to a surface temperature of 43°C and below.
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Canon's design is likely more aimed at keeping that 82°C away from the external surface then it is about cooling the camera.
A skilled engineer (and Canon has loads) knew what they were trying to do an it appears they achieved it.
- Heat pads vs thermal paste.
- no real heat flow from the thermal pads to the back of the Camera.
Safe operating temperatures.
Even without any mod, CF card slot could reach 57 already (base on Lensrental's article).
So I assume that, even with the mod, the part of camera that would be continously hold is slightly above the 43 degree threshold or even lower.
The hot back which reach 50 is still under the threshold for "touched shortly" and "maybe touch".