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None of the text was visible on the page.
I obviously don't know much about spamming techniques, as I have always tried to do well by providing content.
So, what is going on at that site?
If you want to see whether they have blocked the SE from retrieving their CSS file, you can download the "www.theirsite.com/robots.txt" file and check to see if either the file or the directory containing the file has been marked as disallowed to search bots.
I'm not certain of the impact cloaking the CSS file would have on maintaining a spammed SE listing, though.