Not too surprising I guess; an Assyrian cult brought in by the Mittani (from NW Assyria) when they took over from the Hittites?
Nope. The "Neo-Assyrian Empire" refers to a resurgence of Assyrian power; the earlier Akkadian period ended in some kind of disaster, but there were various Assyrian city-states ruling local areas. The "Curse of Agade" keyword should turn up a bunch of topics about the fall of the Akkadian Empire.
The conventional pseudochronology separates Mitanni from their later, actual identity, that of the Medes. The Hittites were an ethnic group, but they never had a "forgotten empire" -- they were under foreign rule, the Babylonians, and likewise separated from their actual time.