>This is as if you started explaining how an ICE car works by diving into chemical properties of petrol.

But wouldn't explaining the chemistry actually be acceptable if the title was, "The chemistry you need to start understanding Internal Combustion Engines"

That's analogous to what the author did. The title was "The maths ..." -- and then the body of the article fulfills the title by explaining the math relevant to LLMs.

It seems like you wished the author wrote a different article that doesn't match the title.

'The maths you need to start understanding LLMs'.

You don't need that math to start understanding LLMs. In fact, I'd argue its harmful to start there unless your goal is to 'take me on a epic journey of all the things mankind needed to figure out to make LLMs work from the absolute basics'.