[Easy to solve] This app was wrongly builded
The application be.ppareit.shutdown (https://f-droid.org/repository/browse/?fdid=be.ppareit.shutdown) was builded incorrectly: R.bool.emulate_shutdowns is set to 'true'. You should change it to 'false' so that the app really executes the shutdown/reboot command, else, the application does nothing - shows a Toaster saying "Emulating shutdown."
Fix: just change emulate_shutdowns here: https://github.com/ppareit/Shutdown/blob/master/res/values/bools.xml from 'true' to 'false' before building.