Exactly, also the development team outright stated in a
Letter From the Producer Live a few years ago that all FF worlds are basically seperate dimensions/universes, they're not other Shards to Hydaelyn or on other planets in the same universe - names of places from other FF games that appear in FFXIV are just references to those other games with little to no direct story connection to them (they're just fanservice, nothing more):
Note that was many years before they added the Return to Ivalice raid however, but the idea is still current - each FF world takes places in it's own seperate universe (despite some hinting at connections between some games - the infamous tongue-in-cheek FFVII-FFX link being one), and that will be the same with FFXVI.
As Cleretic stated, the
Dissidia games already stated that every FF game is it's own independent universe loosely connected by the Dimensional Rift, but, to confuse matters, this is a
seperate Dimensional Rift to FFXIV's one, so... the distinction needs to be stated (and to confuse matters even more, the other name for the FF-reoccurring Dimensional Rift is...
the Void) as they're seperate things with the same name.