I do believe it, but for whatever it's worth (maybe not much!):
If the author is willing and able to write understandable English, I'd prefer to read their version (even if it's very imperfect) than the LLM-polished version.
Alternatively, I'll happily read an article that was written in the author's native language and then translated directly to English.
This one bothered me because it's pretty clearly neither of those things, and so it reads just like any other LLM-written/LLM-polished piece.
[edit: just realised 'willing and able' might sound snarky in some way! All I meant was to acknowledge that even if you can write in a second (or third, etc.) language, you might not want to]
Believe it or not, when you write a blog post in a different language, it really helps to use an LLM, even just to fix your grammar mistakes etc.
I assume that’s most likely what happened here too.