Are you talking about the Notion site? I don’t think this is under his control. In case you’re not Tried it Notion is a note taking app (it’s pretty good).
I was also somewhat frustrated by notion's UI choices and wonder if as a quick hack you could get it into markdown and shove it in a gist (trying to optimise for "annoy me less with as little effort as possible for you" here ;)
Since the content of the page is pretty stable now, I can probably host it in more normal way than Notion.