NVIDIA AFIAK even doesn't produce radiation harderned chips..A lot of this equipment being bought by Nvidia is not being used for gen AI. It's being used for other purposes such as ad revenue and keeping users engaged which has been stated by many Big Tech firms.
So now the rabbit is out the hat and we all know the need was inflated and overstated. What next is anybody's guess.
If to make chip at least a bit radiation hardened you will need to use multiple technologies and enough space between transistors etc as sufficient layer of " insulation " as physical measure for bare minimum step....
Ofc xxxxxx other challenges for solid state semiconductors specialists . ....