The site has always been much smaller than Facebook, and it only mattered because politicians, journalists, and those who currently pass for public intellectuals were using it. Whether you read The New York Times or watched Fox News, you would encounter content that began its life on Twitter.
This article is a big long hot take. Which is fine, it's kind of entertaining. But yeah if you care what the NYT and Fox News are printing on a daily basis you might feel a little untethered at the moment. Understanding that the two are linked is so close to understanding . . . something.