Thats like saying BP invented oil. To claim a plaintext only comment, sans markdown syntax, as markdown is a big stretch to make. But I understand you will want to make that stretch inorder to justify the magic utility of the format. Thats a big whatever from me.
Anyway. Im not going to argue this further. Agreed to disagree.
The comments are written in a markup language (Markdown, UBB, whatever...) which is then converted to HTML.
It's transformed and not displayed as-is.