Well, considering most of the 1.x music (which most players had become familiar with over the 2 years 1.x was playable for) was removed in A Realm Reborn, replaced with new remixes or completely new pieces and that 1.x has also been gone for over a year now, yes it could be considered nostalgic. It's even been commented on as being nostalgic by people I've played with due to the Hard Modes having more in common with the 1.x originals than the 2.0 Normal Modes.

So I think fondly reminding them of the game XIV used to be (and the memories they have of it), which some people still managed to enjoy, is something that would be something that could be called nostalgia.