It’s the difference between saying something and acting it out/doing it. No one, least of all me, denies he said it. I’m saying there’s only one piece of evidence that he actually acted on it, and that is an ex wife who was none too happy with him at the time.
I don’t know how old you are, but saying “I’m bisexual” in 1976 was prior to the era of tightly defined sexual expressions in the area of homosexuality and bisexuality. In 76, to say it was to imply that you do it.