Well, the circled objects are default P3D library objects, something I don't expect to see in a payware airport from one of the leading airport scenery developers.
We always used some default library objects for years, for minor things like radio huts, small constructions, antennas, ils transmitters, vor, etc.
You don't find that acceptable, do you?
Why not ? If the default object is serviceable and doesn't affect the fps, I cannot see why it shouldn't be used, as we always did. It's not as if we do the whole scenery with library objects: there might be just a couple of them, amounts HUNDREDS of custom objects.
But again, we always used some default objects, you are making it sound as if it's something "new" happened in KIAH, but it's not.