I had a look at their blog page out of curiosity, not that you can prove much from the purported dates and text on a blog, which could be edited at any time.
The blog posts from 2010s are in a completely different style and written by a human: https://www.greyblake.com/blog/vim-preview-plugin/ https://www.greyblake.com/blog/how-to-install-firefox-icewea... https://www.greyblake.com/blog/unexpected-ruby-behaviour/ ...
This new blog post is clearly AI edited (probably 'improved' with AI), the old ones are not.
The first link you cited[0] shows up on the Wayback Machine[1] for the first time on 2022-05-16 - more than 11 years after it was purportedly written.
[0] https://www.greyblake.com/blog/vim-preview-plugin/
[1] https://web.archive.org/web/20220516225844/https://www.greyb...