So text files are considered avant-garde now?

Well browsers can't format plaintext. Better question why is he serving plaintext documents on the web in the 21st century?

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Same holds true for HTML, the quite popular web format that features cutting edge technology like <p style="text-align: center">.

Read the article in emacs. Looks great as it’s plain text.

It's a txt file. If you don't know what that is, it's bit like a markdown file, but without the emojis and bullet points. If you can't consume a txt file, that's a failing on your part.

Sorry, you're saying that middle-aligned, i.e. centered text is sensible to you, but traditional left-aligned formatting, as seen in almost all written works published in the last several centuries, is avant-garde to you? What?

ctrl+shift+r enables reader mode in firefox