There was a documentary on the history channel about this plane several years ago. Hitler ordered it built in order to be able to take the A bomb that they were developing to New York. Then they realized its stealth capability. After the war we captured it with other technology and brought one here.
It was warehoused at the Air and Space Museum facility at Dulles and Lockheed engineers stumbled upon it and realized what it was, taking inspiration from it.
The Go-229 was designed as a fighter.
Hitler might have ordered a plane built to take the non-existant German A-bomb to New York, but it wasn't the Go-229.