you didn't answer the question at all.
it may be the same way he mocks able-bodied folks, but WHY does he do it in that particular manner? If not to mock the particular physical disability that some folks have? (including the reporter in question)
it seems pretty clear that the jerking, arm-clutched-to-the-chest motion is the same thing that elementary school kids do to make fun of disabled people. surely you aren't claiming it to be purely coincidental that he chose that very specific physical action.
if your argument is that he mocks able-bodied and disabled folks in the same way, by pretending they all have a physical disability of the arm and hand that causes muscle spasms, then you aren't really helping the case.