I don't think this post reads as AI at all. It has none of the tell-tale signs either (em dashes, common constructions like 'not just ____ but ____, bullet points, headers, etc.)
What ruined it for you?
Compared to what we see on most blogs, even patio11's, this is capital-A Art.
Bill spent a lot of energy fighting commercialization of his work, arguing that it would devalue his characters and their personalities. I don’t know what is cheaper than using an AI model to instantly generate similar art, for free.