I would mostly agree with this except that he was presumably doing this on university property at
a request of the university so even if he was buzzing people this is something that needs to be
taken up with the university not with the FAA or the police.
Nonsense. Land owners do not get to create private regulations for the use of the airspace over their property, nor can they waive federal regulations that already exist governing that airspace. It doesn't matter if the "land owner" is the state of Virginia or not.
If he is low enough to the ground to "buzz" people then in my opinion he
would fall into a vague "university airspace".
Please stop. You have no clue. There is no "vague university airspace". If you look at the sectional chart for the airspace around CHO (Charlottseville Airport) you see some dashed lines that either encompass the UVA heliport or come really damn close. That dashed line means the airspace is controlled from "the ground up". It is there to protect the safety of all flight, not just the flights of people who want to participate in the regulations.
Likewise if someone is flying over my house low
enough to "buzz" me at my house, then are in my "air space" aka "personal space".
You can no more authorize a pilot to violate the 500 foot rule so he can buzz your house than UVA could authorize this guy.
Just like you can't walk through my backyard without my permission you shouldn't be able to fly through my backyard without my permission or some sort of
relationship with me.
Well, you'll be happy to know that unless your backyard is huge and the pilot can remain further than "500 feet [ftom] any person, vessel, vehicle, or structure", AND you live in a sparsely populated area, flying through your backyard is already illegal. If you're in a more populated area, the rule becomes "1000 feet above the highest obstacle within 2000 feet of the aircraft." But nowhere in the aviation regulations does it say you can waive that rule. It doesn't matter if the pilot has a "relationship" with you, nor can you give your permission.
A UPS driver gets temporary permission to walk through my yard and a
public sideway gives temporary permission to walk through my yard but otherwise it's mostly
considered my yard.
What law gives a UPS driver "temporary permission" to walk through your back yard? It's considered your back yard, not "mostly considered". UPS has no special privileges, there is no easement for UPS deliveries through people's back yards. Now, it is hard to get one arrested for trespassing until you've explicitly told one to leave (or posted the area explicitly) but that doesn't mean he has "temporary permission" to be there.