You just have to read his blog, it is short and he answered everything.

> he used python and xelatex

> https://github.com/ttmc/hello-world-ways

Yep, and for syntax highlighting, I used the minted package [1]. Internally, minted uses the Pygments library [2].

[1] https://ctan.org/pkg/minted

[2] https://pygments.org/