> I assume the post is suggesting the Twitter api has been "removed" in relation to the reader apps being blocked.

Your assumption is right, that’s what I was hinting at. I might be wrong but I strongly suspect this is all intentional.

> Anyone got more context on what the "missing" page was?

I don’t know exactly, I assume some sort of landing page with links to your aforementioned resources.

EDIT: Here’s the Web Archive link:

https://web.archive.org/web/20221119170753/https://developer...