A little research led me to this amazing discovery:
Extract from the newspaper "la Charente libre" of September 27
PRANZAC: CALL TO WITNESS FOR A Worrying Disappearance
Denis Chatelot is 59 years old. He left his home at a place called "Chez Mono" in Pranzac on September 14th and has not given any news since. For the gendarmerie, this is a worrying disappearance.
Note: Pranzac is located near the town of Angoulème, of which he often spoke.
PS: you will note that the day of his disappearance coincides exactly with that of his last message on the Usinages site ...
His last messages on econology date from September 11 and he would have made a simple visit on the 18th (4 days after his disappearance) ...