IRS = Internal Revenue Service, the U.S. bureaucracy in charge of
I am aware what IRS is in the US, but Mathieu is French and I think their taxes are collected by some part of MINEFI. I cannot find what French IRS is, so maybe he did just goof and think he was on a USian list. Very confusing, as ever. TSO, NCVO, HMCE, IR/CA...