The article makes no firm claims that one can agree with. The OP is an Abrahamic theist's dishonest misrepresentation of a piece of scientific research. As such it is typical - we see such posting frequently on science forums. And it does not directly assert that atheists do not exist - that would create accountability, something such people avoid if at all possible (using, for example, weasel outs such as "true sense" of "atheist" that can mean anything required). Instead, it asks bad faith questions phrased to frame the issue, and makes vague allusions to undescribed situations and categories.