A few things here (with citations).

France has stated that a "health pass" would be required for cafes, restaurants, shopping centres, hospitals, retirement homes and social institutions, as well as for long-distance trips on flights, trains or buses (https://www.indiatoday.in/fact-check/story/fact-check-france-has-not-banned-unvaccinated-people-from-purchasing-food-at-supermarkets-1828670-2021-07-15)

The health passes are required in places of 50 people or more (https://www.gouvernement.fr/pass-sanitaire-toutes-les-reponses-a-vos-questions). To be fair however, after August 9th the 50 people requirement was removed (and no limit was specifically set).

I find your 99.9% number questionable. Where did you find that, beside the hyper-reliable twatter comments? Also, if they are requiring to show these passes, one would logically assume that at some point, they would not allow those without the passes or else this whole thing literally serves no purpose.