The title of the article doesn't mention TUIs (or UIs at all) but I was thinking of a GUI. Specifically it seems I was likely thinking of Pharo (which is '00s not '90s so off by a decade).
The article subtitle is: "A deep dive into the text mode editors we had and how they compare to today's".
The second paragraph says: "This time around, I want to look at the pure text-based IDEs that we had in that era before Windows eclipsed the PC industry."
