Where does that blurb come from, chatgpt? I don't think it's true anymore, last time I checked I think Gentoo had a "normal" liveCD installation for the base system, which you could then recompile on your own if wanted.
GRP (Gentoo packages) existed at least 20 years ago, from my memory, as that's the last time I really used it in anger. I remeber packages being available and not having to rice everything, for sure.
