(Possible dupe, though I haven't seen the mis-match explicitly mentioned.)
If nothing else, which is right? Just curious.
The badge page is maintained by Stack Exchange itself. It's official. The query descriptions, on the other hand, are filled in by whoever makes the query, which could be anyone.
The requirements used to be 600, but were changed to 500 in February(HT:animuson). When in doubt, trust the badges page (or a relevant meta post from an employee).