First off, in actually using Zola or Hugo, there really is minimal difference in syntax, and I really have to squint to see whether there is stylistic input from their host languages.

Second, people should use the tools they want to to get the job done. If they already know Hugo, and they want to create a blog, it's fine that they use Hugo.

Finally, the bigger decision that the blogger seems to be trying to make is to avoid LLMs in writing, which I admire, and IMO is the far more important technology choice in making their blog.

Why? What purpose does it serve? Who benefits from it?

Use right tools! don't be a die hard fan of any language.

However, I used many tech stacks including Hexo navy theme, Docusaurus, Docsy but ended up creating my own setup with Hugo. If you can see, in the project it's more or html/css that can be used with any builder.

If anything, I’m less likely to trust learning materials from someone who refuses to consider other languages, especially if they go so far as to avoid using tooling unless it’s written in a specific language.