Earlier quoted context omitted.
The Manhattan project was a government project that was run like a startup. If such a project happened today, academic scientists would be trying to figure out ways to bend their existing research to match the grants. Then it would take another 30 years before people started to ask why nothing has been delivered yet.
Run like a startup in what respect? It was a massive government-directed military project in wartime that was able to recruit all the top theoretical physicists at the time around a common aim in an urgent technological arms race to build the bomb. It included a vast effort of army engineers to build the facilities to process the fuel and so on. I'm not seeing the parallels with startups.
There was a hook to get the funding (easy to get weapons funding in wartime). Recruiting the top talent. Urgency (beat everybody else to the punch). Outsourcing the building of infrastructure while you focus on the unique/hard part.
I'm not seeing how you can't see the parallels with startups.