Good article and a reminder that all might not be as it seems, and I'm glad they're reporting this to the French Police as well as raising awareness. The language used in the emails do suggest it could be a single zealot rather than a professional body. It also highlights how often "but what about the children?" is used to enact censorship. (Not least by my own government in the UK with the OSA)

I have one issue though;

The complaints against the site look extremely suspicious. In our case, they came from an organization that was only recently registered that seems deliberately set up to hide the identities of those behind it.

Surely anyone registering any online organisation today would want to take reasonable steps to protect their real identity, especially one dealing with such sensitive matters? Anyone thwarted would want that information for malicious ends.