The article says, "Airpooler’s legal counsel is a former Assistant Chief Counsel for Regulation at the FAA", so I suspect they have a reasonable idea of what's legal and what's not. On the other hand, as they saying goes, "We're the FAA. We're not happy until you're not happy", so, yeah, anything's possible.
That being said, having been a flight instructor myself, I've seen a lot of amazingly scary aviation being committed. You are truly taking your life in your hands when you jump into an unfamiliar plane with an unfamiliar pilot. And I'm not sure if the mechanical condition of the average GA plane or the skill of the average GA pilot frightens me more.