I don't use lineage OS myself, but I thought the same as I read the first few sections of this article. This "guide", if anything will just confuse the less tech savvy users rather than help.

wiki.lineageos.org has specific install instructions for every phone/device they support, I have no idea why you would choose to follow anything else.

just as an example, for the Nintendo switch v2(devices built after the homebrew method was patched) can be found at:

https://wiki.lineageos.org/devices/nx_tab/install/variant2/

There's an install guide for almost every android capable device for the last decade on the wiki!