I see how you're getting that, but I don't think the license is intended that way or would be enforced that way. When they say "makes a claim," they mean "makes

I see how you're getting that, but I don't think the license is intended that way or would be enforced that way. When they say "makes a claim," they mean "makes a claim to an entity with the power to grant the claim and invalidate the patent," not "makes a claim on Twitter." As context, patent litigation comes up in one of two ways: either a patent holder alleges that their patent is being violated, or a non-patent-holder alleges that a patent is invalid. The (a) and (b) in this license seem to be meant to cover those two situations.