Honestly I think it's the real reason. Dude is just trying to search an excuse to stop lmao
It makes sense if you think about it.
The complete remake of a game that was fine and just ended removed content for more than a year, the very little CG added each update, he even released a complete game on the side while getting patreon support for this game and sold the other game full price on dlsite while milking supporters.
Dude is probably done since a while now and try to do as minimum as possible while making good money.