They mention openscad in the book:

We loved it too and created many “thingies” with it. However, as experienced software engineers, we also had a few points of critique. While OpenSCAD is easy to learn and has a syntax reminiscent of C, we felt the language could be improved in several ways:

• more specialization for creating graphics,
• better support for modular programming,
• strict typing and unit handling,
• a syntax closer to Rust than to C,
• a solid library system,
• plugin support for other programming languages,
• and a more powerful visualization concept.

https://docs.microcad.xyz/language/book/intro/preface.html