Doesn't follow logically Edit
Doesn't follow logically. When a conclusion does not derive logically, it doesn't meant that it necessarily is incorrect, this must determined by other means.
Darwin's chance conclusion got falsified with the discovery of the complexity of the cell, this did not falsify the circularity of assuming the Adaptation conclusion in the premise. Circularity as a subset of tautology isn't falsifiable.
Which is why the Epicureans are now gunning for the law of excluded middle, the very fabric of our language - The God delusion.