From the article: the Fromms live in a neighborhood with large homes and have a corral, barn, pool and huge back lawn on their property, so parking and noise aren’t a problem.
Yes, I read that. As for the noise part, at least during the study, I'm pretty sure I agree it's "not a problem," meaning it's not detectable or bothersome to neighbors.
I don't know the details of the parking or traffic flow, but the practice has added 10-20, maybe more cars, coming and going in a tight time window. Most neighbors have no issue with it, but one does, and the code is what it is.
I think the code is too restrictive, with "3" (which is usually not including householders) being the line where a use permit is required, and Fromms can argue that to a judge. The 1st amendment is not going to help them AT ALL. Not any more than the 2nd amendment helped Presser when he said he didn't need a parade permit, because his parade is armed, and requiring a permit offends the 2nd amendment.