[1] https://projectfailures.wordpress.com/2018/03/24/follow-up-o...
An article in French about it: https://www.franceinter.fr/emissions/secrets-d-info/secrets-...
In 2018 it still does not exist. The French government has decided to try again, awarding the contract to the same company.
I am not sure they actually worked on Louvois, so this is possibly another unrelated epic failure.
[1] https://projectfailures.wordpress.com/2018/03/24/follow-up-o...