The article has it backwards: GUIs are the third way of using Linux. TUIs are the 2nd way. I mean, stuff like pico, nano, vi, Emacs - these are all TUIs.

Perhaps it's because I grew up on DOS that I think that way, but one of the reasons I switched from Windows to Linux decades ago was to use TUIs.

All the TUI stuff you can leave running in tmux and then have a consistent workspace remotely accessible from your PC or phone is indeed really nice. IRC, mail, torrents, notetaking, etc.