Perhaps its under that name to get around Modi's current "make in India" policy. Interesting that it is only for 6 helicopters. Maybe serving mostly as a sample of defense tech relations with the US more than anything else, to test the waters, before diving deeper into America's new Indo-Pacific strategy. Or maybe the reason is totally different and is not much of a rreason but more of a just because. Just some thoughts.
As far as I can tell, all the other recent Apache sales go by only as "FMS" like on page 20 on this document.