Questions 1 and 2 are identical
Question 1, "Can you attack with more than one weapon when using Extra Attack?" asks:
When one uses the Extra Attack class feature, must it be done with only one weapon?
Question 2, "Can you attack with different weapons using Extra Attack?" asks:
Assuming I am holding two different weapons, [...] can I attack once ...
I would say reopen #1 and leave #2 and #3 as is. I believe you were correct with your interpretation as mentioned in the "rereading" paragraph. However #3 is attempting to clarify if the damage from AoA is only valid with the THP granted by AoA or if it works with any THP.