To Ivalice fans...SPOILER ALERT

[Enkidoh]

The development team have stated in the past that Hydaelyn has no direct connection with any other FF world - yes, there are references to things in past FF games, but they're just references for fanservice and are not 'proof' that Hyaedlyn is Ivalice/Coccoon/Vana'diel/The Planet/<insert other random FF world here>. That link you mentioned is best taken in context with a much earlier Q@A reply Bayohne posted (the link for which has sadly disappeared, which was formerly found here, but I saved it for posterity):

Q55: There are a lot of names from Ivalice such as Dalmasca, Belias, and Zodiak that have been mentioned, is there some connection between Hydaelyn and Ivalice?

A55: To be absolutely clear, there is no connection between FFXIV’s Hydaelyn and FFXII’s Ivalice. Likewise there is no connection with FFXI’s Vana’diel. Each are their own individual world. Based on this, there are connections between the things that appear in the world, and we’ll be revealing more in the future.

So, when you read that with this latest video comment from Yoshi, all that means is that as far as the game's story is concerned, it's just a reference to a past FF game and that the Zodiark here has no connection to the Ivalice games. It's just a name (like each Cid being a unique character in every FF title).