Visited on May 20 without charging.
The M-CHARGE station is not at the same place where the SAK chargers used to be. I have not looked around for the SAK location, but based on old pictures it's not the same. Based on the live data, it seems like both locations where working concurrently for about a week before the SAK chargers were removed.
There are no directions. Since it's just a single charger, it's a bit difficult to spot in the parking. It's on the entrance level, in the north corner. The whole floor seems to be painted pink and there are no sector names.
The parking entrance is combined with Migros and Coop. You take the right lane towards Migros, then each shopping center has its own ticket gate. There's an underground foot passage connecting the 2 sides if you want to use the M-CHARGE or Energie360 chargers and shop on the other side.