Check out the 2005 Elite guide. Under the old rules, only segments flown under certain fare classes were "EQSs". For 2005, the number of segments required to gain elite status is higher than in the past, but all fare classes on NW give you elite qualifying segments. So it's no mistake--T and K fares (as with any other paid fare class) will give you an elite qualifying segment now, but you need more EQSs to attain any given elite level.