Aurora, back in the 1980s was other worldly in its capabilities.
As was the Lockheed D-21 in the late 1960s.
The problem is the laws of physics. Going fast requires lots of fuel, which has a limited energy density, that fuel is heavy, limiting the payload/range.
The only way that the report is even vaguely feasible is by using non carbon fuels. And if the USA had this technology surely they would be applying it to everything.
What is for sure is that the Americans will be investing a lot of money and technology spying on Iran. But for years they have been able to hijack webcams without the user knowing. So they know the inside of many secret facilities in Russia, China, Iran, North Korea etc. Always put tape over your webcam when you are not using it.