nope, it will not protect you just yet (maybe when an sxos stable version comes out)... i tested this out using the pokemon brick nsp and even though i installed it in the sd emunand it still bricked my whole system... you can try it out yourself.
just please have a nand bakup ready
how's this even possible ? if the brick payload should write anything, it should be write to the emunand, your sysnand should be safe , can anyone confirm or explain this ?