As often the truth got a bit distorted through translation and re-reporting. Unfortunately it's getting a bit late for me to explain in details but hopefully if you can read this article it should clear things up:

http://www.lemonde.fr/les-decodeurs/article/2014/04/11/la-le...

In short, not all workers are concerned. For instance I work as a developer for a french company but I'm not bound by the "Syntec", so it does not concern me.