Haven't you noticed that the homepage does not include the X widget anymore ? It's been removed [1] exactly because of that, i.e the content is not public anymore.
I'm not sure what you are seeing, but perhaps it's just a login wall. I was able to read it; I'm logged in but have never paid for Twitter or X. X does tend to hide certain things (such as replies and replied-to tweets) if you're not logged in.
Anyhow, here's the same article:
https://www.digitalmars.com/articles/Cobvious.html
Fun fact: X's article formatter recognizes D code!