What does "AA guns" here (osm.org/node/4472711501) mean?

Here is a part of the hiking trail missing. Please check on site and add the missing part.

Is this "Mount Lewis"?

Heisst dieses Gebäude wirklich "Bing Aerial"?

Buildings missing here

Is there a summit (volcano) called "Fagradalsfjall"? This name is often referred to in the press in connection with the volcano eruption in march 2021.

Is there a new building missing (Gottfried-Keller-Straße 3)?

Is this hill called "French Peak"?

Is there still a shanty?

Is this the right place for "Little Mollyhawk"? There are higher hills northwest to this place.