Yes it doesn't work. i tried to print a statical site which included a tiddler with a Tmaps widget in order to test it. i don't know the exact error anymore, but it didn't work.
In general, tiddlymaps makes oftentimes makes problems in combination with other plugins important in that regard, like stroll in particular, and with a lot of tiddlers will bloat. so I think one would maybe look for a tool that's more sleek.
I think one could try to work with the vis.js or the graphviz plugins that are available. and there' also another graphing tool i found in the search using "UML" which seems to rely on graphviz
https://github.com/tobibeer/tw5-plantuml.
the people at "org-roam" seem to use graphviz. that's all i can say right now, def wouldn't have the skills to make a plugin work.