Depends on the implementation details.

If you could identify, say, a defunct aluminium smelting plant?

It'll probably have access to 30 megawatts of power. You'd have to give nvidia quite a lot of money get enough GPUs to consume that.

Agreed, it seems wildly optimistic to me. I was working at a military installation command last year and it would often take 6 months just to survey some existing buildings for renovation + repurposing and trying to get those plans approved. Stuff like "repaint these walls, mitigate mold, and install sub-divided chain-link fence in this warehouse" was busting our timelines. I'm assuming that just getting the paperwork right for a Federal government construction project is an equally-huge lift.

The contracts will go to Google and Amazon who can lay down a Data center in months