did you noticed the link you referred to last year went offline?Yup that's how the scam usually works
Yup you got a check from a fake bank . Depending on which country you try and cash that check you could end up in jail. See below:
https://www.offshorereviews.com/blog/credit-foncier-comoros-fake-bank
Even the real Credit Foncier in France warns of scam sites on its web page.
https://www.creditfoncier.eu/
https://www.creditfoncier.eu
Wonder what authority that should be and what weight it has at all!