The French government site allows searching with a wildcard, so I've done F-%LDE and come up with nothing appropriate (on that site, % is the wildcard character).
Aerodrome Sisteron is the site of two companies into electric flight. Electravia provided the batteries for a Cri-Cri that flew the Channel/Manche. E-props makes propellers optimised for electric powered aircraft; two firms with splendidly transparent names, but a Google search produces no images that look anything like this creature. Anyway, our object seems to have upward pointing exhaust stacks, apparently six per nacelle. Is that plausible?
EDITED: I wrote this before seeing the engine identified: they're intakes, if it is the Hirth, which looks likely.
Last edited by FlightlessParrot; 23rd May 2021 at 10:08.
Reason: Wrong assumptions.