One of the two full-scale aircraft was a helicopter. I doubt that the FAA will make a special rule for helicopters.
I suspect they will require it in all ClassD airspace which would exclude heliports. Heliports do not get a class D airspace because they generallydo not have a control tower, unless located at or near an airport.
And there's at least as much reason to notify small airports as large ones.
I disagree, I don't see that uncontrolled single user airports need to be notified. But the FAA could see it your way.