Tbh, I wouldn't say he died with 100% certainty, he already did a mini-hiatus for like 6 months before, so it won't surprise me if he just quit H-games developpement without saying a word.Idk about it being v1.01 but the game is LITERALLY uncomplete. Author died, maybe that is the version in JP or a special version in CI EN, or a special version from that website that don't align with the actual product version. Yeah someone can probably MTL this but it will be forever an incomplete game. A beta or alpha or some shit.
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This is his last post on Ci-EN. Updates about the game, last post is December 2023 almost 2 years at this point. Either he got jailed, found a new job, or the most likely reason is he died. Artists/ indie devs (specially something as NICHE as H games) are all about the passion in making games (sure some devs just make lazy cashgrab games but this dev definitely is not one to just outright abandon his last project without saying a FINAL word).
It's quite like when an artist of your favorite manga dies (a prominent example would be Miura of Berserk). The story can be completed by someone else/ someone with close ties to the original creator but it will never be the same. I'm saying this as a fellow fan of this developer since their games where pretty nice in quality and scenarios.
I don't think he will ever come back, but I don't think he died either. He probably had enough with H-dev and since we already saw that he CAN just disappear without a word (my theory is that he already planned to leave definitely with his 6 months hiatus, but changed his mind), I think he just did.