Yes, that's why the risk is NOT the same between French Guiana and New Caledonia. Both of them are oversea territories far from the mainland with a colonial past, but their current relationship with the mainland is very different.
Around a quarter of the population of New Caledonia has been calling for independence for decades at this point, with 3 referendum organised during the last 10 years to resolve this issue. Only half of the population was able to vote to the referendums (and some local elections, like Congress of NC), due to local rules than are about to change–this, incidentally, is the cause of the protests you are talking about. On the geopolitical side of things, the independentists are probably propped up by Azerbaijan (https://www.courrierinternational.com/article/geopolitique-n...) and maybe China (https://www.lefigaro.fr/international/ambitions-geostrategiq...).
None of this holds for French Guiana. The risk between these territories is not the same. At all. Putting them on the same level by reducing them to their status as former colonies is nonsense.
Sure, placing launch infrastructure in French Guiana is probably less risky than setting up shop in New Caledonia. Clearly, the risk profile is not the same for all of Overseas France.
My point is that if the decision is between mainland and Overseas France, the latter introduces elevated risk in the long term in general. French Guiana could be fine today, but it is not impossible that the next few years could see the rise of a populist pro-independence movement that would eventually impact launch infrastructure (similar to how it did for the USSR).
Reality is fundamentally chaotic after all.