Quite so. 2020 is far too late though. If the game really has been in development since 2010 (according to the KH3 page here) then that's 10 years of development, counting things like change of engine and possibly even platform (no doubt it was originally being developed for PS3). If we don't include that, then development has probably gone on for about 4-5 years now. KH3 is basically ending up like another FFXV. Hopefully, it doesn't end up as bad as FFXV though.
Yeah and considering SE's game developement cycle with these sort of big games, I won't be surprised if we don't see KH3 until near the end of the PS4's life cycle and FF7 Remake releases on the PS5 similiar with FF XV. This is what I honestly hate about SE. They make some great games but they can take forever making them. I'm not saying that they should rush developement of both games and release a dissapointing, piss poor title like SEGA did with Sonic 06. But they should also not take too long in developing their games. Otherwise fans will lose interest after waiting for so long especially if you barely give any new information on it. And than there's the possibility of multiple changes in story/scenerios. If that often happenes than the final game's story could become a hot mess. FF XV is a perfect example of this.