Been trying to find any information about IBM Virtual Worlds OR IBM Digital Library for some time. Recent tweet sparked this thread, as this person seems to have found a magazine screenshot of what looks to be a newer IBM virtual world client, with the same assets and design as Worlds Chat.
https://twitter.com/vg_history/status/1578688392233385984

This is definitely not what you're looking for but I think it's an interesting document to add and preserve here: IBM GIO Gaming Report