I still have the feeling this is more of a stunt to bring attention on Station F than on the startups themselves. Beyond the buzz, there is very little vision. It's a giant intensive farm in a denser, currently-under-redevelopment neighborhood.
In this super dense setting, they're piling up various talent for sort-of-low-cost rents, hoping to raise unicorns thanks to nearby campuses, increased VC flow in Paris and general attention towards startups. This strikes me as a formula thought out by people who have never actually been in a successful startup (Roxanne Varza has been successful at _talking about_ startups, never at actually building things).
One outcome is that all those points successfully connect together. Another, more probable outcome is that it will turn out impossible to keep focus, talent and purpose in a giant, open space (also probably soon to be under-maintained judging by French standards).