At least he got a good answer about Faya. Perhaps Maurice F should ask for help from 'Le Directeur'?
Checked again the other day and Le Point stopped doing Chad (that food & drink link is 6 months old), but my impression is that despite 'Libya', Chad is going through one of its periodic lulls when it's safe to travel. They don't seem to come very often and maybe its already too unsafe, as the letter suggests.
I get the feeling legit Sahara trade and tourism is like a river: as one area gets blocked the flow finds another way round - as with Mori, Libya and Gilf opening up in the 90s when Alg and Niger were too risky.
Some may remember Ginge Fullen from the book (p377 - The Last Saharan Summit). As it happens he is trying to help start up an agency for the north of Chad with his former guides - or maybe its the other way round. If anyone wants a contact, send a PM. Prices about the same as Niger. It won't be Abercrombie & Kent, but what is in Chad.
I wish I'd jumped at the chance with an LPA tour to Faya.
Forum contrib Gerbert was there last year. One of the few:
Sahara Overland ~ Tibesti 2010