This view is much easier to defend than the one in favor of new reactor designs. However, the fundamental debate is about renewables vs. nuclear, and factually, nuclear, even in a nation with good uranium deposits + good track record + design safer than most other ones... is increasingly difficult to defend.
> don't modernize it too much
The price to pay for this is high because it means giving up on trying to resolve some of the problems of nuclear power (risk of accidents, dependence on uranium, waste, proliferation of weapons, etc.).
> it might still be cheap
Projects over the past two decades show that even projects with improved old reactor designs (rather than radically new concepts) fail.
> Decouple Pod
It seems to me that he misses some key points, for example won't such an underground setup be way more difficult to inspect and even more to maintain/repair? Long-term waste repositories projects are way less demanding and their costs are exploding.