That's correct! In fact when we announced this we mentioned that the BBS technique was what inspired this PR:

https://twitter.com/charmcli/status/1320184218794795010

It's interesting to see forgotten lore or techniques reemerge. We (Charm) have just published a TUI framework called Bubble Tea and imgcat was one of the first tools that implemented it, so we were excited to see the progress and help with rendering.

https://github.com/charmbracelet/bubbletea