The method mentioned in the link you shared is indeed interesting and probably also works with NetBSD among others, but relies on having third party controls
(such as having to select a grub entry and run the installer steps from a cloud control panel).
The reason I experimented and wrote this article was because I thought interesting to find a way to avoid having to rely on any external controls.
Thus this works even on bare metal servers and thanks to QEMU to install absolutely any OS that can boot on QEMU.
The method mentioned in the link you shared is indeed interesting and probably also works with NetBSD among others, but relies on having third party controls
(such as having to select a grub entry and run the installer steps from a cloud control panel).
The reason I experimented and wrote this article was because I thought interesting to find a way to avoid having to rely on any external controls.
Thus this works even on bare metal servers and thanks to QEMU to install absolutely any OS that can boot on QEMU.