Ignore this guy. Considering his join date, and his terminology and demeanor, he clearly has an agenda. I'd suspect him as an arbitrator, or someone with close ties to the manufacturer who is trying to get you to agree to something in a public forum, and use it against you later.
You have a solid case, and you should only use this forum as a way to document the ensuing process.
If I had to guess, I'd say this batch of tires wasn't cured correctly, and the compounds didn't harden correctly. That's the guess of an ill educated lay person, but your description seems to imply something of this nature.
I have a C14, and this tire is talked about ALOT on zggtr.org, which is how I got this link, from my forum.
So Michelin, stop d1ck1ng this guy around. Alot of us are watching what you do here.