I was finally able to visit on Tuesday. I didn't charge.
It's the largest Migros in number of chargers, but it's a complete mess.
The chargers are split across 5 area on 3 different floors.
Each floor has its own ticket gate, and I guess you could immediately exit without paying if you don't find a free charger on the floor you entered, but there's officially no free period here.
There are zero directions for chargers. You have to search for them. In P1 you might notice the fast charger even before entering the ticket gate because it's right next to the entrance. In P2 there's a very small sign hanging from the ceiling above the chargers, but if you reach that point you will see the chargers anyway. That sign dates back from the free charger period.
There are 3 AC chargers on each floor, for the total of 9 chargers. But they are placed differently on each floor. In P1 they are shortly after the entrance after the West side with angled parking spots. In P2 they are near the lift with angled parking spots in the opposite direction of P1. In P3 they are on the West side again but this time as parallel parking spots.
The 50kW DC charger is in P2 on the back of the AC chargers, which is a half-floor a little lower than the main parking.
The 160kW DC charger is in P1 next to the entrance ticket gate, but you can't turn right, you have to drive around the entire floor to come back there.
The 4 parking spots for the 2 DC chargers are not painted yet. The 160kW charger was not usable while I was there because it was blocked by cars not charging. There was also one of the AC chargers ICEd by a Porsche.
There are illuminated signs next to each floor name at the entrance, telling which parkings are open for who. When I entered, only P3 indicated for "Kunden", but I didn't get to take a picture or remember what the others said. When I came back to take a picture, all 3 floor said "Kunden" again. I asked the information center and they weren't able to explain to me how that works exactly. It seems like you can enter any of the parking floors no matter what it says.