Steam import insists that Kingdom Hearts III + Re Mind is not in completionators library even though it is (game #75524). Since it wasn't adding I quick added it to my library and reran the importer. The importer still insists that the game is missing from completionator.

Another side related item is that the Kingdom Hearts III + Re Mind is listed as unreleased even though it was released in June.

Games processed through the Steam import are not automatically text-matched. A curator must link the Completionator item to a Steam item. I just linked this one, so it should start coming through now (though if you've already added it to your collection, then it won't be added again).