I had a quick perusal through the study and one interesting interpretation of the inventory they used to determine/define what 'sexist' is, could be;

sexist=non-feminist (or person who doesn't ascribe to feminist ideology) and non-sexist=feminist.

So, using this, it could be said that what they have found is that women who hold feminist beliefs are less likely to hold non-feminist beliefs when pursuing a short-term mating strategy! Who would've thought!

(P.S. Just so I'm not misconstrued, I used quotation marks around the word sexist not to indicate any hostility or skepticism about the concept of sexism itself but instead to more easily indicate that the word sexist is the subject of the determination/defining process being discussed and also to indicate the importance of that word's definition to my argument.)