except $4T is a made up number, a complete fantasy not rooted in any reality. it us more like $750bn (this is also made up number) :)
The 409a has a lot of words and numbers to justify a particular valuation. It's not made up from the ether based on nothing. You can disagree with their reasoning and come to a different number, but you need to show your work if you want anyone to give a shit about your made up number. How many satellites have you launched this year? What's the going rate for a kilogram to LEO? Who are the competitors and what do they charge? Things like that which aren't magic made up numbers.
All valuations are “made up” numbers.