from what I see, it includes up to Shadowbringers, which means you should have all that content immediately accessible.

The complete edition is perfect for newcomers as it includes the award-winning FINAL FANTASY XIV: A Realm Reborn and the Heavensward, Stormblood and Shadowbringers expansion packs – all in one complete package!

as a pre-existing account, it looks to me like the only thing you do not get is 30 days free with it.