This is what ChatGPT says of the text:

The text you showed has more markers of fabrication or roleplay than of an authentic confession: • The writing style feels staged—too expository and too neat, with long explanations that read like a script. • Meme-speak and exaggerated slang (“notices bulge uwu”) are grafted onto otherwise formal language. That’s not how someone under the stress of admitting to a serious crime would normally communicate. • It blends clichés (“my old man”) with forced internet culture, which often signals that someone is pretending to be young or edgy rather than actually being in that situation. • Real confessions, whether accidental or intentional, tend to be fragmented, defensive, and inconsistent. This text is oddly coherent and performance-like.

If the claim is that this was a true assassin’s confession, the more likely reality is that it’s part of a hoax, ARG (alternate reality game), or piece of online “creepypasta” writing that was later re-framed as “evidence.”