This is a step in the right direction. Hopefully this will evolve into a flasher-less solution soon.
Yes, but the console needs to comply to the two prerequisites:
1. Its factory OFW was 3.56 or lower.
2. Must contain Metldr and NOT metldr2
The above pretty much limits this discovery to the early to mid CECH-2500 models and older. After those, metldr2, bootldr2, and lv0.2 were introduced.