Both the SCP-2454 and SCP-2510 SCP articles contain writing that was falsely portrayed by Metaphysician as his own work.
In 2017, Metaphysician agreed to cite or remove all material from his articles which he did not write. He then failed to do so with SCP-2510, as such he has been presenting the work of others as his own by exclusion.
Per the site plagiarism rules:
Borrowing from other works is generally fine, so long as there is not a blatant or malicious attempt to deceive the reader into believing that the work is your own.
SCP-2454 is cut-and-dry, containing written directly plagiarized from Wikipedia.
Again citing the plagiarism policy:
You may not attempt to pass off another user's article as your own work.
The prescribed consequence of plagiarism is:
Doing so will result in the work being summarily deleted.
Both of these works are to be summarily deleted.
The rewrite team is not currently seeking or accepting applications to rewrite either article.
Whether you like it or not, history is on our side. We will bury you!