The SE's are smart enough to realize that the coordinates are outside the displayed area of the page and that technique has been employed for a while now. These pages end up being flagged for review, so take that to mean whatever you like.
Google's Matt Cutts has this to say about using CSS to hide text:
Quote:
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"I don’t recommend that people use CSS to hide text"
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Source:
SEO Mistakes: Unwise comments