Are those games you mentioned, are they made by just one person or team? snats checks every byte of the game so that nothing is wrong, it is alone. This update as he mentioned before, is the biggest ever made so far, he added several characters, places and actions, not to mention the sex scenes. The guy really takes the game seriously.
genuine question, does it matter? if you wanna pull the "1 man work" argument i could point to other examples that would blow twisted world out of the water, like stardew valley or cave story, so lets not go there, since i dont really care if it was 1 guy, or 20, if anything, it would actually be far more impressive if he had help, as that would translate into a more complex development.
also, the argument was never if the dev takes this game serious or not, but about the game being, and i quote " One of the most well-developed H game there is " which i responded with examples of projects that are far better developed when it comes to content delivered and update time. both of which are important when talking about being well developed.
and, again i gotta say this, im not bashing the guy, i really like the game, im just pointing out that i dont consider it as well developed as those games i listed specially when the sandbox aspect is so incredibly disapointing.