What do you think about:
In France, there is a Chinese proverb that says “…”?
Is it just a joke or something serious?
If there is a Chinese Proverb that is only used by the subgroup of chinese speakers in france, this could be totally serious.
Otherwise, at least in Germany I know people saying “Old chinese proverb!” jokingly, often for some kind of common sense-based proverb-like thing they just made up.