Not really. The mythical man month fallacy of 9 women making a baby in 1 month is about rushing a specific project, and having the coordination between the individuals make it take longer. For something way bigger, like the whole field of nuclear fusion, as opposed to shipping an app next quarter, more people means more work can happen. Having more smart people work on fusion instead of HFT (eg Jim Simons), would lead to progress and advancement in the field, compared to not.