Ah, nice.

I bought an old minitel for 3€ a year ago, still intending to stuff a pi zero inside to achieve mostly that -- but more bulky, owning to the CRT tube.

It would be nice to make it foldable. Maybe consider e-ink as an option for the screen?

I like the fact that this just charges over USB-C, and communicates over a "full-sized" RS-232 connector. How convenient ! But is it a typo and they meant a DB-9 connector instead of "DE"-9? I know no such connector, and it looks like a DB-9 to me, although I see no picture from the back.