Harry Shin wrote:

So, I'm wondering if their overhead approach to an un-controlled field is
"approved"?

Descending into a leg of the pattern is generally considered to be less than safe
due to the risk of a collision. It's a little less dangerous when the descending
aircraft is a high-wing, but it's still frowned upon.

George Patterson
Great discoveries are not announced with "Eureka!". What's usually said is
"Hummmmm... That's interesting...."