Unfortunate - they didn't pin the version of Three.js they were using for the interactive viewer at https://www.math.uwaterloo.ca/tsp/star/star10m_tour.html

And as a result it's been broken since May 2022: https://github.com/mrdoob/three.js/releases/tag/r141

I downloaded the HTML file and replaced the link with a versioned one, and the viewer still works just fine.