You missed the point of the study. The things they put in the geek room are things that college students associated with CS students.
Therefore, thinking about the "stereotypical geek" is virtually guaranteed when being put in the geek room. The study doesn't say "are geeks really like this or not" it is more about what an outsiders perception of geeks is.
But then I am not sure what useful conclusion to draw from that research. Is it even useful research? Without the study I could also have told you that few women like Star Wars figurines. That is why they are associated with geeks...
Should there now be an ad campaign displaying normal looking geeks?
Therefore, thinking about the "stereotypical geek" is virtually guaranteed when being put in the geek room. The study doesn't say "are geeks really like this or not" it is more about what an outsiders perception of geeks is.