If you look at the replies[1] to that tweet, many commenters point out his style was entirely different prior to chatgpt.

[1] https://xcancel.com/maxwelltani/status/2023089526445371777?

I was giving this the benefit of the doubt as well and was just looking at his older writings that have a little "This article is more than 5 years old" banner above it. Looks totally different indeed.