The device never shows up in Nautilus. Before it did and that was how I "Safely Removed Device". How can the device be listed in a bash terminal but not in Nautilus.
This thing is maddening. Before when I could see the device in Nautilus and would push to the sdcard, I could never find the file I pushed. Now when I can see the file I pushed the device has disappeared from nautilus so I can't safely unmount! Obviously this is user-error. Maybe that's why Apple makes a locked bootloader for customers like me.