People seem skeptical that it's actually been ruled out by that test. Regardless, that paper found diamagnetism on the level of pyrolytic graphite, which would be interesting in this material albeit not really evidence of superconductivity, but from what I've heard it is very easy to get anomalous reports of diamagnetism during zero field cooling if there is a high-temperature ferromagnetic transition, and you have to be extremely careful about your measurements and do lots of repeated tests to be sure. AFAIK, every other paper has either only seen very weak diamagnetism (expected given the compounds involved) or none at all.