The VisualizationLayer doesn't draw the TechMapPath shapes because they inherit the MapShape (MapPath) object. VisualizationLayer doesn't work with MapShape objects. Instead, you will need to use MapShapeData. You can read more about this in the Map Shape Data article.
In your case, you can replace the MapPath with PathData. I've updated your project to show this approach. I hope it helps.
As a side note, I would ask you to remove the Telerik dlls from the GitHub repository or replace them with a trial version, because the repo is public and the dlls are licensed.
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