So you know nothing about Rav Aaron. That’s okay. But don’t go on and on about how it’s only halacha. If you accept Rav Besser anecdote as true, that there can just as easily be all kinds of meta reasons for the mattirim. This can easily become absurd. Maybe they only built the eiruv because they thought that it was accepted to so.
And I reread your post. Here it is:
…after an Agudas Harabbnim meeting, which Rav Moshe did not attend, he asked Rav Tuvia what occurred at the meeting.
Rav Tuvia was there. Why? Rav Moshe was not. It’s news to me that Rav Tuvia was a member of Hisachdus in the 1950s.