This article is overall nice, but it has a few issues I noticed while reading:
"Hum" is written where I presume you mean "Hume" in the containment procedures.
Imperial units generally aren't used in professional documents, such as those of the SCP Foundation. Metric units would make much more sense.
"Wonder World" and "Wonderworld" are both inconsistently used to refer to the same thing.
Two of the three headlines in the newspaper snippet are bloat that are entirely unrelated to the rest of the article.
Perhaps I'm missing something, but I don't quite understand why the Foundation were insistent upon containing and combating the emerging Wonderworld; with the masquerade broken and the representatives posing no direct threat, doing so seems nonsensical. I'd presume this is because they don't want Wonderworld to have enough political power to hamper their other operations, but it isn't made clear what opposing goals they would have to lead to the Foundation blockading and invading them.
I hope my feedback is helpful to you in getting this article into the best shape it can be. I'll change my vote when it's fixed up if you shoot me a message, provided you decide to make changes based on my feedback.