That isn't precisely true. While everyone has PTS access that includes the base game and everyone can try the base game changes that come with Updates, access to Chapter features is gated behind invites. So you will have PTS access to all the 'free for all' base game features (e.g. you could try the Guild Finder feature and could play around with Volendrung in Cyro, which were added in Elswey'r Update 22) but you won't have access to the expansion features themselves unless ZOS grants you PTS Chapter access (e.g. you wouldn't be able to try the new zone or the new class or the new trial in Elsweyr).Yes, you would have access to everything.