Noticed the same problem, however, Super + R is an Explorer shortcut. If it's not running it should not work. Ctrl + Art + Del should still work as it's read by the Winlogon process but from there you can ran run task manager which he deleted. Cmd.exe is still available and there are ways to boot into the OS with it's window starting automatically. Definetly would have loved to see CSRSS.exe or ntoskrnl.exe get deleted or any other core component.