4C Plus NVME Missing Commands

Hello, I’ve been trying to use Mehod2 from this guide to install ubuntu-server on nvme: https://wiki.radxa.com/Rockpi4/install/NVME
The commands listed do not seem to exist in the repository. Is there a newer guide or other method to be used for the 4C Plus? I see it’s not exactly listed in the guide. Maybe it’s too new?