For companies acting within the science or innovative space, France is a haven. CIR is a tax return that covers 30% of R&D personnel, JEI is a status that halves the taxes on personnel for 8 years, and nullifies gov taxes the first year, halving them the second year. Add to this the region and gov backed projects that match 50% of your investment in a project.
The truth is it is much much cheaper than in the US, and probably unmatched in Western Europe. Now, all this preexisted Macron.
Some hurdles remain investment, low margins for companies around 20 employees and 2M yearly, they get stuck at that stage and lack of transparency.
One major pain is interacting with large French corporations, with payment delays unheard of in the US. This slows many startups down when it does not kill them. Once bootstrapped it seems to get better.
I'm not sure what a startup nation is not whether I'd like to live in it, but France is certainly in good position to fuel early small innovative & scientific companies, not more but not less :)