Actually, I rigorously continuity-checked this earlier today. Look at the lore on the website -

The Empire took over Ala Mhigo 15 years ago, /was stopped by the unexpected presence of a Primal/, waited around 5 years for reasons we don't know, then tried to press forward into Eorzea, //and then were stopped decisively at the battle of Silvertear Falls//, and have been waiting another 10 years since then.

Curiouser and curiouser!