Flew around France ( freight, nights ) for almost 7 years and never even heard this rumour...
On the other hand, we regularly joked amongst ourselves about how many the ATC'ers had had with their dinner whenever we were issued with corrected instructions...
And there was one guy in the Tower at a fairly large airfield on the Atlantic Coast who was notorious for his consumption of the odd 'petit blanc' at 30 minute intervals throughout the night....seems that he was the only guy who would work the night shift, so got away with it for years.
On the other hand, this IS France we are discussing...
Prost !