Many moons ago Twitter used to have RSS (Atom?) feeds for each user so you could use any old news aggregator to keep up to date.
HN is probably the last true aggregator site left that I know of.
It's partly why the web is so much worse. There's really no reason to create content outside of a walled platform is it is getting increasingly difficult to find an audience for it. Even blogging is an uphill battle since more and more social media sites penalize link sharing (they want you to create the content on their platform and leave it there).
That's why it's not surprising that these APIs are disappearing since the fundamental model has changed.
And nothing has changed after Twitter went private under Musk, except that the reasons for stuffing unwanted content into users’ timelines are slightly different.