The machine it ran on, the “Lilith Workstation”, sounded familiar and searching for it I saw that yes, I had read about and seen pictures of that machine before, made at ETH Zürich by Modula Systems in 1980:
“The DISER Lilith is a custom built workstation computer based on the Advanced Micro Devices (AMD) 2901 bit slicing processor, created by a group led by Niklaus Wirth at ETH Zürich.” https://en.wikipedia.org/wiki/Lilith_(computer)
There is a video from a Swiss TV programme in 1983 here: https://inf.ethz.ch/news-and-events/spotlights/infk-news-cha... But it “is not available outside of Switzerland”, so I can’t check whether the Lara text editor is included in the demonstration.