Except Yesterday was recorded in June 1965, and they were in Austria filming Help! in March. As I said, Paul is placing an an event at a time, however you play with it, is wrong. You're guessing he means Yesterday, I'm guessing he has the wrong location and date.
What cannot be argued, is that he has told that exact story for at least 20 years, and that it appears in Anthology, and so there is no way to argue that Anthology about Love Me Do may not contain mistakes. The majority of the evidence, statements (including from Ringo) and documents, suggest ...