See the description of the APPROTECT register in section 14 of the nrf52832 product spec and the Debug and Trace section which describes how the debug port has no access when app protection is enabled.
Is it then still possible to erase the Flash using the SWD debug port?
I want to be able to disable the Readback but it should still be possible to do a full erase and program a new content via the SWD debug port