These numbers were always out of line with basic infrastructure constraints. People were talking like the US would build 50 new nuclear power plants in 10 years. And I believe we will not see $600B either, there are basic infrastructure, permitting, and power delivery limits.
It's not unforeseeable that the US demarcates Special Economic Zones without environmental oversight or labor regulations to speed up the construction.
However, we are all going to be paying higher energy costs for these ridiculous infrastructure claims. Utilities typically price out energy three years in advance. If they were protecting for twice as many energy sinks, that represents an enormous amount of generation capacity which needs to be accounted for in projections.
I saw a report that previous capacity pricing was $28/MWh/day. Latest numbers have shot up to $300.