Both of these have been rewritten. Night Monster was meant to be very rare initially, so that's what the wiki stated but RNG seems to be on everyone's side recently. Not the first time I've heard a complaint about people saying it's not in fact rare. It is supposed to be, but what can you do really.
It's recommended to choose one or the other though for teachers/status. Hard to obtain both. Possible, just very difficult. Hence the initial tidbit.
It's meant to be as accurate as possible, but there's only so much I can personally do. Balance changes tend to mess up some key details on the wiki, or events are made more common, for example. I'm trying my best to fix glaring issues, though. Bring it up to me and I'll re-edit, or you can just do that yourself, seeing as you don't need an account to make edits.
The wiki is user-updated, true, not just by me. That means others may add info that sometimes falls under the radar. I can't manually check if everything not added by me is perfectly accurate to how it is in-game, that's just not feasible - I don't have the patience to do that, really.
Some take directly from the game's code, others write down what they encountered in-game like me, or from word of mouth from others (such as here or on Discord, for example). It's hard to keep track of every single edit, so it's inevitable you might get misinfo here and there, though like I said I will try my best to fix up misinfo if I discover it myself or someone else points it out to me or others. If it's from Gonery, it's generally always accurate as he's one of the people that takes from the code I mentioned, hence his pages being so detailed in comparison to mine sometimes (lol). Speaking of which, he just typed up the first bit of the new Body Fluids page, found here:
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Not done yet at all, but it's definitely getting there. I noticed recently there wasn't any info on the wiki about milk/semen production so I brought it up to him. There was only a brief bit in the Cafe Campaign page. He added volume and wetness to it as well.