I'm not sure why the PDF was chosen as the submission. The PDF says:

Note: You are currently viewing an automatically generated PDF version of our on- line lectures, which are located at http://quant-econ.net Please visit the website for more information on the aims and scope of the lectures and the two language options (Julia or Python). This PDF is generated from a set of source files that are orientated towards the website and to HTML output. As a result, the presentation quality can be less consistent than the website.

And, indeed, the website is very nice. It'd be nice to change the link to the website.