I find it confusing that author proposes llms.txt, but the content is actually markdown? I get that they tried to follow the convention, but then why not make it a simple text file like the robots.txt is?
Same idea here IMO. .md would signal the wrong intent, as you don't want to render it to markdown formatting or read as a markdown file normally is. You want it to be read as plain unrendered text.
Sam
Unrelated, but the comment two steps above has the same username pattern as yours (3 letters+00)
iflath wasn't change enough?