You forgot this part, in real life who the hell knows what they did on a specific day in 1969? "Memoirs" are not diaries, they are memories and impressions of long ago events...in this case nearly a half century ago. They are not usually "time stamped" and "attendance listed" to the satisfaction of some knave, nearly 50 years hence, who wants to go nuts over the general impressions and recollections of a brief meeting.
Here are some of my life events, of less than precise recollection: shook hands with Agnew, not sure at which function or hotel. Spoke to Charles Kuralt, at some building in Miami, or Miami beach in 1972. Saw Reagan in LA, at some LA hotel on some date prior to 1976 convention. Saw WFBuckley, sometime within a several year period (off and on) at JC. Sometime in the mid 1970s I was offered a probationary status to a grad program at Chico (I didn't have a BA but had good GRE scores). I can't recall the guys name, but I think he was head of the Poly Sci department (or Public Policy). I don't recall the date or exact year.
It does not mean anyone is intentionally lying - folks conflate events and mix up sequences all the time. Their general impressions may be correct, but their specifics might be off. If so, who the heck cares how this nothing-burger went down, other than to smear obessed "gotcha" journalists?