I feel like the key word here is resignation. Platinum has changed from its early days and so has the quality of its output (Babylon's Fall; Astral Chain, which I loved everything about but the gameplay). It is possible that because of the capital injection/investment by Tencent, Kamiya doesn't have the same creative freedom/pull to make the games he wants anymore.

Unless he speaks up we will never know, and I doubt he will. Can't wait to see what's next for him tho.