> consider that interpreting a word in a way at variance to the rest of the conversation will leave you, unnecessarily, wondering what the conversation is even about, as in this case

True.

So why did you do so?

You're well aware that in common parlance, markdown refers to any of the following incomplete list: Gruber's Markdown reference implementation (practically extinct in the wild), Git-flavored Markdown, and Commonmark. There are others, Julia's version of Markdown has some extensions and is missing at least one feature from the original. Its standard library for parsing this is called Markdown.

To write the comment you wrote, you had to pretend that you didn't know this. That's disingenuous. That kind of "what you're referring to is actually GNU/Linux" sort of nitpick is annoying.