Yeah there is next to no chance he's actually working remotely close to a full time schedule. I can say that with a high degree of certainty after learning how little effort actually goes into these renders.
Once you get workflows set up it would be even less effort. You can get really consistent results with workflows and they also have a poser you could use, alongside a bunch of other tools. As a complete beginner I made that render and animation.
You can make the same / very similar renders as him in virtually a few hours of learning ComfyUI, pretty much every character in the game right now is from a preset found for free on CivitAI.
I made this as an example using Perfect Pony XL - Hinata Hyuga (Naruto) || Leti - ExpressiveH (Hentai LoRa Style) and then I loaded an image from the game as a reference. You can get a closer look to his if you lower the denoise value, this is what the preset looks like. If you spend time on it they come out way better you could also upscale the images this is just what came out on the first try for the sake of an example.
The hard part is coding though, which is probably where the majority of his time is actually spent but with the money he is making and the fact that he is working full time he could literally 3x the amount of content per update if he actually worked full time on it or hired people to help code.