They have been open about developing this camera since early 2019 (They just didn't give a name and show it until early this year)
So it is safe to say that they knew what they were doing, and how it is going to cope with overheating on the hardware side.
They probably had some options to make it better regarding overheating, but I think it is pretty expensive as-is (despite being similar to the EOS R in quite a few aspects), and it does not need to be even bigger and heavier in this form.
The RED Komodo uses the same technology with a different crop factor (and also with a global shutter mode), so they can utilise this new sensor in a more serious video camera if they want to.