I am wondering if this is truly an 'airspace issue'. There may be more details which contributed to this whole scenario.
My roomate spends the summers guiding throughout the GC, and has offered me a few insights. He began by telling me about the "permit" structure of everything which happens on tribal lands. This is their primary means of generating revenue, by tapping the tourist market for just about everything.
In the original article, it claimed he was arrested, whereas in the later articles he was not arrested, but only cited for trespass. One of the articles claimed he did not have the "permit" to fly over the tribal lands. Whether the tribe has a right to charge for airspace use is what will likely be the primary question if that is the main charge of the citation.
Another one of the "permits" that is required on reservation land is to take photographs. As this incident seems to revolve around the camera, I wonder if this is one of the charges. If he was observed taking pictures from the air, then the reservation police may leave tribal lands to issue the citation, but probably got a little overzealous by towing his camper.
Apparently his camper was returned relatively quickly. Supposedly there are many people just "squatting" on both Federal and Reservation lands in that area. They park their RV or camper, and live off doing the bare minimums.
This guy is French and if he fits within this profile, might be an illegal, or an overstayer. One article claims he has been guiding bus tours in the area for some time. It would be interesting to know if he had the appropriate permits to do so.
It will be interesting to see how this turns out....