As far as I can tell from skimming the paper, it fails to establish that ideology impairs reasoning more than any other kind of pre-existing belief. There is a

As far as I can tell from skimming the paper, it fails to establish that ideology impairs reasoning more than any other kind of pre-existing belief. There is a well-established bias, called belief bias (which the paper mentions), against accepting the logical validity of arguments whose conclusions you disbelieve. The study tested examples of this where the conclusions were political (agreed with liberal or conservative viewpoints), but AFAICT did not use a control test where the conclusions were apolitical, but the participants still agreed or disagreed with them. A control could have established whether political arguments were more (or less, or equally) susceptible to belief bias. But they didn't use one. So the study only establishes that political arguments are susceptible to belief bias.