Don't think it's a method to keep a persistent CFW after power off the console, it just take the advantage of sleep mode, and mainly to avoid re-inject after a crash.One thing that's still not clear, is if this will make coldboot into CFW possible or not?
I mean, I know you need RCM to do it initially, but after setting up CFW with RCM, will we be able to power off, and boot up the Switch directly into CFW without the need of RCM?
The way the video is handled makes it seem as if it's only something used when Atmosphere errors out, not from a coldboot.