Nah, it's via the store.The GPU perk hasn't shown up for me yet. I do wonder if it will be like some perks were it gives you a code to redeem. Or if it will be like Persona were it directs you to the store. I hope it's the former so I can activate it when ever I want, but it's likely the later one.
Buy FINAL FANTASY XIV Online - Starter Edition - Early Purchase Bonus | Xbox
For newcomers to FINAL FANTASY XIV Online, this edition includes three award-winning titles - FINAL FANTASY XIV: A Realm Reborn the base game, and the first and second expansions: FINAL FANTASY XIV: Heavensward and FINAL FANTASY XIV: Stormblood. This edition also includes a 30-day free play...
www.xbox.com
So if you want to optimize your trial, have to redeem this on like the last day.
If you were buying a complete edition already, then technically, you don't need to get this and optimize your trial as much as possible. For me, I intended to get on starter edition + dawntrail, cause that will give all the previous expansion as well when I get Dawntrail.