Don't read too much into this dictionary though, I spent a year there and not once did anyone call a CEA worker a "shadock". Many of these words are indeed used, but it's akin to company slang more than a language variety. Some people just don't use the local words and nobody cares, and everything changes fast.
> Ainsi comprend-il notamment une longue série d'abréviations et d'acronymes
In that respect it's no different than any (big) corporation in the country. At least one team I've been maintained an internal lexicon but elsewhere it's just an acronym soup everywhere.
[edit] having worked there, seeing “Shadock” being used for “Personnel du Commissariat à l'énergie atomique et aux énergies alternatives” really made my day. Now I know how to call former colleagues!