Game setting info beyond some basic blurbs in those rulebooks are not published online for free, but those aren’t needed if you want to homebrew your own setting.

There’s a caveat: there’s some extra character options in the APs, and not all of them are covered in Archives of Nethys. I had a new player join in on the Gatewalkers campaign I’m running and spent feats to pick up Verdant Core deviant abilities, which aren’t on the site.

Granted, the root cause was Pathbuilder not having any filter for which deviant feats a player can take, but not having it on Archives of Nethys or my physical copies of Dark Archive and Gatewalkers made it so much harder to unfuck