The French UHD has HDR10, not SDR. I own this release (and also the one from Camera Obscura, Germany). The German release has HDR10. (both companies are doing some projects together, also this one - in the French release, they give credit to Camera Obscura. It wouldn^t make a lot of sense, if the French are using a different grading than the Germans).
It's also noted on several websites which discussed the French release - always HDR10. The problem: The French didn't note it on their release: https://www.mondo-digital.com/bluesunshine.html or a French one: https://www.dvdclassik.com/test/blu-ray ... t-qui-fume