It could have been strategy instead of insanity. By starting conversations at $7T you anchor high and potentially drive a greater outcome than starting an order of magnitude lower.
If he had said $250 billion and six fabs, it would have been a lot to ask but people wouldn't think he was ignorant or irrational for saying it. Big tech for example has that kind of money to throw around spread out across a decade if the investment is a truly great opportunity.