This question is mainly for the mods. The other day I submitted something to the guides, but it seems like it's been taken down. Could I ask why?

The biggest issue with your guide was that it was misleading. It was also vague. Something like this should be more detailed in mentioning the box snipe (which some don't know is faster). And it tries to mention where any% goes but only for the one part, not for the rest of the level. So it makes it seem like the hundo route is the same until that part which is untrue These are the reasons why it was deleted. I asked other people about it for their opinion before I deleted it, btw.

Okay, I see what you mean. It wasn't meant to be a complete guide; just a map to show where you need to go. I did want to make it more detailed and nicer looking, but my computer crashed while I was working on it, and I had something else I needed to do, so I just submitted what I had with the intention of updating it later. Thank you for the feedback. I'll keep what you said in mind when fixing it.

For future reference, would it be better if I asked for permission/verification to submit a guide in the forums?

That would be great. Feel free to message me on twitter or discord and I will give my constructive feedback on it.