Otto Aviation Celera 500L, une enigme?

https://www.flyer.co.uk/bullet-shaped-otto-celera-gets-ready-to-fly/

https://www.euroga.org/forums/aircraft/10897-celera-500l

https://www.planeandpilotmag.com/article/otto-aviations-mysterious-celera-500-has-flown/#.Xc8O60VKhTE

The Drive reports that the FAA says the aircraft’s airworthiness was approved in February 2019 and that it uses the Raikhlin Aircraft Engine Developments (RED) A03 V12 turbodiesel engine.