Yeah, that definition of Atheism is extraordinarily narrow to the point where it's defining a square when it should be defining a rectangle.
The Article states to see the use of them, but then fails to do so itself or even speculate on how they would be used given the scenario Mr. Terrific is encountering.
Instead, the author uses an extremely simplisitic argument to further his conclusion without even attempting to look at how scientific analysis and observation would work in such a scenario.
The author does not even attempt a skeptical analysis of the dieties in question and simply assumes that All Myths Are True even though they are extremely contradictory especially in regards to origin stories and throwing into the fact that many of the laws of physics and nature operate in roughly similar ways to the ones that exist in the real world.