Most games are created by more than one person (assuming it's just him working on the game). You have programmers, artists (audio and video), writers and so on. However, if rendering is the bottleneck, it would be similar for other developers - you just have to wait... Then the question would be if DPC could rent some cloud based rendering farm or maybe improve/streamline the creation process.I'm really wondering if there's some sort of development time limit on DPC. It's already taking 9 months to do one chapter, which means the next chapter will be out in 10 months and the finale only a year later. Then it turns out in the future episode 13 and 14 will be developed over a year and a half, which seems absolutely fantastic. I don't remember any developer in this genre doing one chapter for a year and a half. That seems like nonsense. If he launches this, he may do the finale of the whole game at all for 2 whole years.
This guy has no editor or control whatsoever. If all game developers followed his principle, it would take over 10 years for one game to come out. Just add whatever you want. Unfortunately, it doesn't work that way. Keep only the important stuff, remove everything unnecessary.
On the other hand this status update gave us little information other than nothing burned. He's been out practically all week testing the game and so there's no progress. Probably the next update will be more accurate. It's too early to draw such far-reaching conclusions. But in general I agree with you.
A lot VNs use the combination of a background with character sprites in the front. This allows you to easily create any combination of places and characters. This is not the case here - in Being a DIK most of the scenes are used one time only (Free Roams are notable exceptions) so a lot has to be rendered. And if DPC reused some of the older assets, people would notice (and complain).
Testing/bugfixing the game while the rendering is ongoing is a good usage of that time. I know that testing is usually done by paying customers via early access nowadays, but back in the old days, testing was a thing. What else can he do anyway? Staring at GPUs won't make them work faster.
Also we have no idea about the size of the chapter. Maybe it's big. Maybe it's so big that splitting it in two would have been better. Maybe it wasn't possible due to DPC's creative ideas (some creators prefer to release a full realization of their vision instead of parts of it).
With that being said, I share your concerns. I would prefer 2-3 episodes per year (4-6 months wait time seems reasonable).