(eye roll)...Do you think the senior royals would broadcast it if either yes or no?
No, I think they would have discreetly advised Harry that he would not be included in the line of succession, but that William would find an important role for him. My point being, surely they did the test to either confirm or be able to deny the rumors among themselves, for their own peace of mind. And by the way, Harry looks very much like Charles' father Phillip when Phillip was young.