its not big enough
the RQ-170 is variously reported as 26-28 metres in wingspan
Thats barely 28 FEET across.
Either is a 1/3 scale model or its a previously unreported drone
If its a model, who made it? Who is behind the disinformation?
Looking at it, one gets the impression that it doesn't have enough space to carry the fuel for a long range jet engined mission.