That's not paraphrasing Einstein. He never said the 'definition of insanity' quote.
Far too strong to say he never said it. There is simply no proof he did. My guess is this is a bit like Hanratty, who everyone believed he had definitely been fitted up for the A6 murder, this being one of the main tropes used in the debate to abolish capital punishment.
Anyway, it is a good and apt quote in these circumstances, I'm sure you'd agree.