"almost 100%" is quite a high percentage when you have zero proof that anything he said in the linked interview is a lie, even considering past claims which were quite obviously farcical.
Meanwhile there is a wealth of real world information supporting that this claim is probably true. Nothing he says at any point in this interview is unbelievable, and the author even makes an explicit point of saying RDJ is much more approachable and open, so why attempt to skew him into one of Aesop's fables?