Any weakness in the the sealing structure of any camera is a risk. I don't think this is about insulation so much as an air conditioning and cooling structure - they are trying to let hot air out.
I can't say for sure what is going on inside a camera I cannot tear down and I am slightly amazed that, despite diligent searching, I cannot find decent images of the venting, or a diagram of the weather sealing. Still, it is early days...
However, logic suggests that the system works like that of a submarine, where there is an outer casing that is open to the elements (in a sub you walk on it, with a camera you hold onto it), and then a enclosed hull within that which is sealed. This arrangement would not encompass the whole body, but be a curved shaft behind where the LCD sits. Within that would be the metal conduction surface, which takes heat from the inside and radiates it into the air shaft. As the air heats, it loses pressure and rises, drawing more cool air from the base and venting out the side.
Given the information to hand at present, it is clear that there are intake vents on the base of the camera and obvious outlet vents on the left side by the ports, where hot air coming out should not impact someone holding the camera correctly - that is to say, with the left hand cradling the base of the camera and lens. Thus, the inner shell would be weather sealed, leaving a metal surface inside to radiate heat into the venting cavity and cause the air to travel up and through the venting path.
I have cobbled together a diagram of the passive venting from those elements.
Logic suggests that this has been tested extensively before release to the market, but if you are unsure I would hold back and see how the camera behaves in the hands of the masses, or someone tears it down - maybe Lens Rentals will oblige!
Thank you, that was most interesting!! 🤔
The video and photos rather confirm my suspicion about the heat venting arrangement. There is a false back within which there is a thermal venting shaft, with the holes at the base to accept heat from a sealed metal plate that forms the true back of the camera. This metal plate conducts heat into the void, where the heat rises and is likely dissipated out to the true left of the camera, where there is another set of vents.
Inside that metal plate are the components of the camera and this is my best guess (from the limited imagery available) of the arrangement of heat transfer components from the various chips.
It's hard to be precise without knowing the function of each chip and I can't read the chip IDs at this resolution, but from the materials used, I think this is a reasonable speculation.
