I don't think that is the point though so much as that Google has one standard for their internal findings and another for project zero, which also deals with other companies with the justification that it is better. Mozilla doesn't audit other companies so what they do with their internal finding isn't relevant for that argument. One can of course argue whether it is good, or justified, or not. But I don't think that changes that their is an argument there. If someone wanted to sue Google (ha!) over a project zero disclosure that is likely something they would try to argue. That Google knows that disclosing has consequences.