He's still the Producer, he just stepped down from being Director(meaning that he's too valuable to toss out and TN knows on some level they fucked up since they didn't try to pin all of DOA6's problems on him like Nintendo and the Virtua Boy to Gunpei Yokoi).
And yeah, game development these days are becoming SUPREMELY expensive, some for the right reasons... but mostly the wrong reasons. Despite how much we say to delay games, because of the amount that's being put into games these days, the amount of people working on them and the returns... that's not really a question anymore of how much they can delay without some serious profit loss before the game even comes out.
Look at what happened to Anthem for the biggest example of that. 7 years of development hell and EA asked for the game to be released finally... and look at what they got? And that was millions down the hole that entire time while it was stuck like that for years.
Well, Anthem was delayed so many times because they changed the whole project vision several times but with games like DOA 6, that have a clear concept but "just" need a lot polishment, it shouldn't be a issue delaying it around 6 months ... but that is how Koei is treating almost all its franchises since 1 or 2 years ago.
Dynasty Warriors 9 was a fuck*** mess, Warriors All-Stars was an uninspired and rushed game, Atelier Lydie & Suelle was the worst Atelier in PS4 trilogy, Orochi Warriors 4 has evident lacks in comparison with older entries and also felt rushed, now DOA 6 have been released almost as a early access game and I'm starting to guess what will happen with Nioh 2.
Hell, even when I joke saying Xtreme is now the main DOA franchise, even releasing Venus Vacation and now Scarlet, they still don't fuck*** can add all females and older Xtreme 1 and Xtreme 2 minigames.
I guess for now Koei can make up their initial unit sales with several season passes in all their releases but once people get bored of their shi* they will have a big problem, like Capcom had years ago in the previous generation, with even people calling them Crapcom.
They can't keep these policies forever, this business model is seriously damaging their games quality and meanwhile people could support them buying DLCs in the past because they enjoyed their games is clear as the day right now people is getting tired of Koei shi*.