Also the fact that the words are word-to-word translations of Attack Decay Sustain Release is weird; why would they use exactly the same terms if invented in isolation? Particularly the choice of "déclin" and "soutien" are weird, and "relâche" is clearly wrong ("relâchement" would be the correct term).
This. Think of other early synths like the minikorg 700s. The filter is called the “traveler” for instance. I don’t think that most of the “synth jargon” was coined just yet. Even the mini moog has non standard labeling.
Aside from being a hoax, if the synth is real it’s definitely a very cool project and from what I heard quite usable as a mono synth.