you can get to PoK even without mq2piggyzone, a couple of the PoK stones are still in their original places and will take you to PoK, however PoK is completely devoid of any NPC or interactive item, even the library lift is motionless and not even doorways for the GL/Bazaar. (Also note that while there are some books to take you up, there are no stones that will bring you back down, so you're only option is gate/port, piggyzone, or go skydiving to your death.)
DO NOT ASSUME THAT SOMEONE IN POK USES MQ2 BECAUSE IT IS NOT NECESSARILY TRUE!!!