The process described in the KB article you linked doesn't actually perform the re indexing, it only clears the flags that indicate each item has been indexed. By following the steps in the KB article, you are effectively telling the background indexing process to reindex every item.
How long did you wait between running the provided SQL queries and testing the search again? It is possible that the indexing thread was still processing items when you performed your last search.
You should also keep in mind that while performing a reindex, the background thread will ignore any words that occur in at least 50% of items being indexed. This means that if the word "pronto" occurs in at least half of your KB articles - regardless of case - that word will not be indexed.
Andrew Barker
Software Developer
SmarterTools Inc.
www.smartertools.com