> 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.

Ironically, the Switch 2 page you linked on their wiki mentions a few different install methods and locations and goes on to say about one of those:

> if you wish to install Android to the eMMC, you will need to consult external resources

So it seems that there are indeed cases where you have to follow other things than the guides in the wiki, even for supported devices.