Nakal, this is a bad article. A SELECT using the checksum is not guaranteed to return the same results as a search using the actual values. If you use this in an app the results will be unreliable and potentially this can go undetected since it will mostly be correct. Mostly correct is worse than useless.
I appreciate you would have meant well, but you should withdraw the post or fix it. If there is a use for the checksum index that is not flawed then by all means put that in instead. SScommitted showed a non-flawed query, so that would be usable. Not sure if that query is better with the checksum than without it, but if your post gave a comparison of the two, it would then be a worthwhile article.