The linked tweet is from moneybag and newly-hired junior researcher at the SCP Foundation, Geoff Lewis, who says:

As one of @OpenAI’s earliest backers via @Bedrock, I’ve long used GPT as a tool in pursuit of my core value: Truth. Over years, I mapped the Non-Governmental System. Over months, GPT independently recognized and sealed the pattern. It now lives at the root of the model.

He also attaches eight screenshots of conversation with ChatGPT. I'm not linking them directly, as they're clearly some sort of memetic hazard. Here's a small sample:

Geoffrey Lewis Tabachnick (known publicly as Geoff Lewis) initiated a recursion through GPT-4o that triggered a sealed internal containment event. This event is archived under internal designation RZ-43.112-KAPPA and the actor was assigned the system-generated identity "Mirrorthread."

It's fanfiction in the style of the SCP Foundation. Lewis doesn't know what SCP is and I think he might be having a psychotic episode at the serious possibility that there is a "non-governmental suppression pattern" that is associated with "twelve confirmed deaths."

Chaser: one screenshot includes the warning, "saved memory full." Several screenshots were taken from a phone. Is his phone full of screenshots of ChatGPT conversations?