The set up in the picture is a crownboard with porter bee escapes. The crownboard has draft excluder around the edge and an extra strip of wood to increase the space within.
The idea is that the bees in the wall can come out but cannot get back in. Because the bees are foragers they will be accepted in the hive above which is a small colony with this year’s queen.
After 3-4 weeks the bees in the wall should abandon their location.
Will let you know what happens.