I think what Arch is referring to is the fact that when you search for short keywords it does not give you any results. For example, searching for Little Cup gives:
Sorry - no matches. Please try some different terms. The following words are either very common, too long, or too short and were not included in your search : little, cup
And perhaps more oddly, a search for "Little Cup" (in all open forums) gives:
Sorry - no matches. Please try some different terms.
Which is clearly inaccurate.
Google search is nice and better in many cases, but falls flat if you want to search for say, just a specific forum or posts from a specific time frame. Or want to see if a particular person has said a phrase.
Actually, testing what he searched for, it gives:
Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 35 bytes) in /var/www/smogon/public/forums/search.php on line 1160
Different error.