That bit is a raised platform compared to the rest of the platz. It has tables on it belonging to Lehners Wirtzhaus, surrounded with a barrier that has gaps with steps in it. Although one can walk around there it's not really meant as a throughway. There is a path alongside Lehners (so east-west roughly) & a wider street Waldstraße running along the bottom of the platz. I can take a picture next time I'm past there if it helps. Sorry for the English, just woke up.