I would contend that Twitter does not work great with infinite scrolling. In fact, I kept envisioning Twitter as I read the article. One of my biggest grievances with Twitter (shared with much of modern computing because multi-device computing doesn't have something like PAO [1], which would keep all my devices' views the same) is that I can't easily resume reading my Twitter stream between devices. I can't even easily navigate to "show me the stream at 11am today," which would be a viable workaround for multi-device views. If I want to find a last-read point, I just need to sit with my finger on the page down key until I see something familiar.
Ultimately, my user experience with infinite scrolling is simple: I give up and stop bothering to try to be thorough in my consumption of Twitter content. I wonder if Twitter has the necessary metrics to realize that infinite scroll can hurt engagement. I doubt it.