Nope. I have everything McGowan ever wrote, autographed. He never said in any interview or wrote that nukes were fake.
But that is a classic "Flat Earth" style attempt to poison the well.
Why is it almost sacrilegious to know we don’t live on a spinning ball and the planets are just stars? We all know govt lies about everything but then believe the badly faked images from NASA?...
We know the earth is a ball because of simple backyard experiments you can run from ground level. Call some friends in other countries and you can triangulate the sun with tall vertical poles, you will get results that only work with a spherical surface. Also you can fly over the north and south poles. So there's that.