It states in the article *[our lawyer] advised us that [...] the judges would be extremely deferential to the Rodin Museum and would grant it the benefit of any doubts* but doesn't dare to say why they would be deferential.... It's probably because these high level cultural institutions basically get to do whatever they want... France definitely loves their institutions.
I think the part that stands out is how at least one court went out of its way to invent a new argument on behalf of the museum. I was surprised to learn this is actually somewhat common in French law. The court itself, at least with cases involving administrative actions, has every right to step in like this. It is not a neutral arbiter.