[jhy]

Thanks, AltaVista LiveTopics is a good keyword. I found:

https://www.researchgate.net/figure/Alta-Vista-LiveTopic-Gra...

which has some different coverage.

I did try to archive the blog you linked but unfortunately the owner is blocking it with robots.txt

User-agent: ia_archiver Disallow: /

[bsder]

That hyperbolic tree looks very close to what my faulty memory recalls.

I suspect it was a later incarnation that I used.