There were quite a few shops open, I confess that I didn't see one called "Marketplace"

Munich was my final destination and I followed signs for "Exit" from when I entered the L concourse -- HOWEVER I did have the impression from the signage that I **could** have remained as a non Schengen passenger; taken the segregated part of the train to the H gates; cleared passport control in H as "normal" (at least "normal" from a few weeks ago).

Another two points I forgot to mention which may help:

(1) even though I cleared passport control in the satellite, I could have entered into the G gates (and then obviously go up to H and "re-enter" the non Schengen zone

(2) the train was quite fast and driverless, reminded me of the trains underneath T5 at Heathrow. Unfortunately it wasn't anything like the "moo moo" train which connects the A and E gates at Zurich ))