I'm from the netherlands, if i hear how we talk TODAY and compare that with how we talked back at the end of the 70s beginning of the 80s then i definitely would hear a difference specially the usage of words back then that are hardly used now. It just feels different.

Might i suggest some one native to the french language and compare the "modern" french with the french from the 70s and 80s to hear if there is a difference...?

This might give us a clue whether this is legit or a good hoax....