I don't want to create the type of SCP I hate (one with a fuckton of addendums, interviews, and exploration logs)

addenda

That said though, you've got a ton of collapsibles, including a table that I don't really think contributes to the article at all. Most of the stuff at the bottom can actually be grouped into a single collapsible or just left uncollapsed, I think, since there's just one quote block in each.

General things:

the number (#) numeration is used for extreme precision measurements that can be fatal if misinterpreted, like drug prescriptions. You don't need to do that for easy-to-count whole numbers.

The containment procedures can be waaaaay slimmed down. The entire paragraph starting with "Forged accounts of the island's existence…" can probably be trimmed down to two sentences. I don't think the cover story really needs to be explained in so much detail.

I'm not sure that the O5 Councilmembers would be involved with this SCP. They have more important things to deal with.

My main issue with this is that it kind of boils down to "island with a weird time effect" with a ton of extra details about its discovery, observation, and some silly experimentation things that just sort of bog down the read and distract the reader (the "Submitter requests to visit island. Submitter has paper due for Computer Science college course that he forgot to do, and requests to "quickly bang it out" on the island in order to make 11:59 PM deadline." log can probably just be taken out. It looks unprofessional and doesn't improve the article much).

I recommend getting the base idea polished up in the Ideas and Brainstorming forum before you try fixing the draft. Go to that forum, post a quick summary of the concept you want to write up (don't link the draft unless someone asks), and reviewers there can help you make the idea more interesting and give you some advice on structuring the eventual article for smoothness of reading and narrative.