Wonderful headline! Alas, if you read the story, the conspiracy theorists aren’t really accusing this person of having been replaced by a clone. They are merely (and disappointingly) accusing him of having been replaced by a lookalike.
That is not nearly so interesting.
Of course, either a clone or a mere impostor would surely say exactly the same thing:
“It’s the real me, I assure you. I will soon celebrate my 76th birthday and I will still go strong.”