Earlier quoted context omitted.
You're absolutely correct, but as the aircraft is much closer to the ground than the imaging satellite I disregarded it. Spherical cows and all that :) I'm sure a military analyst would do the calculations!
It actually works out to be pretty close. A satellite flying ~17k mph at 250 miles altitude would largely have the same angular displacement from the ground as a plane moving 400 mph at 31,000 feet. Most satellites fly in an easterly direction, so the question would ultimately be what the inclination of the orbit is relative to the direction of flight.
I think this plane is flying much lower and slower. The B2s are based at Whiteman AFB, which is about 25 miles south of this photograph. The prevailing winds in this part of the country are from the south, so I suspect that it is about to turn onto the final leg of its approach for a landing to the south. I’d guess that it’s no more than 8-10K’ and traveling at a 2-300 knots max.