When the books came out, Peikoff & Co were saying that they were lying about the affair (which he later admitted they had), so don't try saying that we can't believe anything that's in their books. Your attempt to dismiss them out of hand shows a Peikovian intrincism.
I guess I have "Peikovian intrincism" whatever that is, but for which I am eternally grateful! I stand by my statement and will reiterate it as it applies to the Brandens equally as well as to Bill Clinton: known liars lie. All three are self-admitted liars who have repeated, elaborated and sustained numerous lies over long periods of time.