It's not totally true (double the amount of time), as
recreation has previously explained that his other game (Weird Shit Is Going to Happen) is a side project for him (so I don't think he devote as much time for it that for Bad Memories).
And it is made with Honey Select, that take very less time to render scenes than with Daz.
But, still making WSIGH take some time.
Also, he has explained that he has lost one of his graphic card earlier this year, and he just get the replacement recently.
Finally, don't forget that he does this game on is free time, and must have a job to earn a living.
And, I hope for him, also has a life outside his games.