The tweet says he is the CREATIVE PRODUCER of the game. Not the director, not the creative director, not the co-director, not the supervising director, not any sort of director.
CREATIVE PRODUCER, like how Nomura is CREATIVE PRODUCER of Crisis Core, TWEWY, Dissidia, The 3rd Birthday, and FF Type-0.
Still more involved than any other project he worked on in the past 7 years.
This should be the new game that should reboot Tokyo RPG Factory, it looks nothing like I am Setsuna and Lost Sphear.