Without going and checking every spell for their list i don't think they are either, regardless of where they were drawn from. It's explicitly stated they are technically not magic and as such don't qualify for craft wondrous, for example. You prepare your extracts based on your list and the Samsaran adds spells to it's list which'd allow you to prepare those spells specifically because they were added to your list. Though if you drink a cloudkill extract you'd better be immune to poison effects.
