Those instructions for configuring the wireless adapter are from before there was a gui. No need to do that.
If you look further down the dmesg log, you see the following:
Broadcom 43xx driver loaded ERROR: Firmware file "b43/ucode11.fw" not found ERROR: Firmware file "b43-open/ucode11.fw" not found
As Sam suspected, the driver is there but the firmware isn’t installed
Firmware will be included in update after testing.