This isn't Lockheed, this is Northrup Grumman.
It has NOT flown yet, they've said this over and over again, what was rolled out was the first prototype which will start flight testing next year. Which they also said over and over again.
That we know of.
We know the AF has already confirmed the first 6th gen aircraft has already been flying.
Why would they unveil something that isn't even flying?
The F35 for instance was flying, at least variations by the time it became widely known.
Hell, the F35 prototype, the X35 flew in 2000 well before the 09 reveal date iirc.
Followed by the F35A in 06.
So...yeah they have most definitely flown it