it's not time travel and that thanks to yoshida that we know it... while the keynote they did admit that Rak'tika greatwood was the house of the viera.... but! we know that the forest from where are coming the viera of dalmasca is called Golmore jungle!

a good map of dalmsca area:

in this map, we have no rak'tika greatwoord.... means it's possible it's the name of golmore jungle in another shard, like the first shard that is satured of light and more need a warrior of darkness than a warrior of light for stop the 8th calamity!