Not great logic saying that Germany would have. But he does have a small point. A lot of our reason for developing it was because we thought Germany had been working on it. Our development started before Germany had been defeated and we had reason to believe (via espionage) that they at least had collected the materials needed, and had scientists familiar with the physics. After the war, we discovered that their program was no where close to actually making a bomb. We probably could have, and maybe should have stopped once Germany fell.