The article is quite light on details, I wonder on what exact grounds they filed their claim.
That makes no sense to me. Licensing copyrighted work is pretty standard, and it must be in France too? The GPL is a license, which is indeed a contract. But surely people license (enter into a contract between copyright holder and user which grants certain allowed uses) copyrighted work in France routinely?
But if there is a contract in place, then copyright law no longer applies, and you instead have to resolve any disputes as if they were violations of a contract.
The difficulty being that the GPL allows anyone to enter into a contract without even consent of the other party, and the contract law courts may not see that as a valid contract.
https://thehftguy.com/2020/09/15/french-judge-rules-gpl-lice...
Even the makefile had a reference to stockfish.