While the original study does suggest that cats mirror their owner's personalities, the evidence is not sufficient enough to support any definitive claims. The study uses surveys to gather information, and while they are useful, they are less reliable than other scientific research methods. With surveys, people can answer however they wish, whether that be truthfully or not. In this study, people not only answered for themselves, but for their cat, which leaves room for bias. There is also only the one study. So while it is possible that cats mirror their owner's traits, there just is not enough scientific information.