You can use a separate emunand for sx os atmosphere. That's how I was setup at one point. You need to create the sx os emunand first then you can resize the fat32 partition leaving the correct sized partition unformatted as the last partition. You can then use emutool to restore either a nand...
It works no different using sx gear and a chip and you don't risk bricking your chip by flashing a firmware that wasn't really made for it and hasn't gone through a whole lot of testing.
He made similar comments when SX OS was released and he got nowhere. He's just a big baby that believes everyone should worship him. It's quite pathetic.
Plug your switch into a pc then double tap the backplate to push the button on the switchme chip twice. A new drive should show up under my computer. Drag the sx os uf2 to that drive and drop it. The drive should disconnect then reconnect. Unplug it and try to reboot...
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day