And 24 hours later... : just look carefully the video, just the begining... and:
- after 20 seconds, the title of the window is clear & readable: "org super links graph"!
- searching for "org super links graph" gives this article, https://www.libhunt.com/compare-org-super-links-vs-org-super-links-graph
- and then, of course (silly me!) just look at the GitHub repostitory... and find https://github.com/toshism/org-super-links-graph
- with netz.el = all the tools.
And all of this is 100% #Emacs Lisp!
Last step: try this to "see" the text #format notes & their links!