Sounds like a flaw to have planes that CAN’T FLY without a GPS signal.
Perhaps they are not telling the full story. More likely an EMP burst? Still, our warplanes navigation systems have no business being non-rad-hard
It sounds like it might have been the RC-135. I flew on that bird in the Middle East.
Yes, these planes can fly without GPS (they usually carry 2 navigators, 1 using digital, 1 tracking with map and compass - as backup, just for this type of thing) but you must stay on track. They were jamming this time but what happens if they start giving phony data. The RC-135 or whatever plane it was, might stray into North Korean territory and they could legally shoot it down.
And this type of thing is not a new trick. The Russians used to do the same thing from East Germany. They would lure our planes over the border with false NAV beacons.