the Roma are experts at adopting musical styles, then taking them farther, creating hybrid sounds. Django was criticized early on that he wasn't really playing jazz. I suppose because it was something new that the 'purists' hadn't heard. It was jazzy enough for Benny Goodman!
His legacy is enormous, and he's helped provide careers for many 'Gypsies and non-gypsies alike. Whether it's folk or not, well maybe the folk police will determine that...
meanwhile Mr Reinhardt kicked some serious ass...