It works. I use it all the time. Scroll down. It's under "Enable game patcher". The location also changed last November, but wasn't noticed unless you were using nightly. You can get Possum's LumaLocaleSwitcher to make it easy. Get the "NIGHTLY" version.@Aurora Wright
After updating to 7.1 I started having trouble with my out of region game updates. It appears that Luma3DS no longer supports language and region emulation. Is this true? Why would this be removed? I also noticed that it is no longer in the wiki.
https://github.com/AuroraWright/Luma3DS/wiki/Options-and-usage
This is a big deal for me since I have a JPN console but all of my games are USA.