I have no reason to suspect this is from an LLM (I don't have much confidence in my ability to spot anything other than the most obvious examples) but I also don't see any reason to assume that someone couldn't just say something like "add an introduction paragraph plugging my Twitter and live performances in a friendly voice" and get something like this pretty quickly.
Fair enough! I think my meta-point still stands though; I don't see any fundamental reason to assume that an LLM wouldn't generate something similar to this without needing a ton of effort in prompting.
The text has been there since 2018. BERT wouldn't have been able to write like that. https://web.archive.org/web/20180312062205/http://sonic-pi.n...