Arcane City Game Studios

Well, of course a prologue wouldn't work in a mystery horror story, but that's not what I was talking about. It's particularly meaningful for high-concept fantasy and sci-fi world that can be confusing to the player if it's not explained properly. Giving just enough context to make it comprehensible at the beginning, and minimize the need for infodumps when the action picks up pace is pretty optimal. In the case of your story, I simply think it could've done with a lot less info in general. I'd like it more being vague than just explaining the lore this way.
That is a good point, but if you think of it as another method of "scattering" the infodumps to keep the complexity of the world without creating the walls of info in the middle of the story it should still be worth it. I also don't like encyclopedias if they contain information actually crucial to understanding the story – as you said, it can be cool for fleshing out your world, but it can't be a primary method.
...I might also be speaking from one specific trauma of an EVN with a world that was pretty much incomprehensible because of lack of proper exposition, and with encyclopedia which created more questions than it answered. A good prologue could've done miracles for that game.

I think infodumps at the beginning are rarely employed because there is no in-story-conflict yet readers can connect it to. At least to me they feel more like homework than useful information most of the time and I tend to get bored before the actual story even begins.
A way of infodumping that's rather unique to VNs that can be rather effective is adding opportunities for expositioning outside of the actual story. For example an encyclopedia can be a good way of explaining things characters in-universe wouldn't talk about normally without taking you out of the story for too long. 428 utilizes this feature brilliantly, adding funny side stories to its exposition and even secretly setting up plot devices. VA-11 also has an approach I really like where you read news stories and internet boards inbetween story-sections (although admittedly it's used more for world building than infodumping).