Define builders
You appear to be of the opinion that paying someone to do something makes you a keynsian. If I don't get paid, I don't build. At the end of the day, I have to put food on the table
Discussion
https://mises.org/wire/why-must-supply-precede-demand-understanding-economic-foundations
Saying buikders need funding first is a fallacy. Funding is someone seeking a good or service, a demand. Builder do not need funding to build.
I do nof get paid for many things i build. Things worth building will be built, regardless of funding. Fiat prices has distorted market perception.