I'd say those tires are out of warranty . . .
I am pleasantly surprised to see that the Montlhery track is still being used. It was the track that our Mondial had its first race on in May 1955, the GP of Paris - back when the drivers had real courage since there was no guardrail at the top of that bank.
After the track was no longer used for racing. it was Michelin's test track, but they stopped using and maintaining it. The rumor a couple of years ago was that it was slated for demolition - complaining neighbors . . . .