Did you read the post? He's discussing the typical coursework needed for a math degree. I've not bought his book and am not interested in becoming a quant, yet I've found his site to be a useful source of tips and textbooks for me as I self-study mathematics.
There are about a half dozen ads (and a fade-in popover) above the actually content. It's a terrible site design from the perspective of someone wanting to read the content on mobile, but the article is there.
I also just left without reading it, due to the ads.
I'm actually in the process of overhauling the design of the site, particularly with regards to mobile, as the current Bootstrap-derived design pushes all sidebar content to the top on mobile/table.
Indeed, this is the latest article and it does link back to parts 1 & 2.
Each part of the series is designed to cover the "typical" modules on a UK four-year undergraduate Masters of Mathematics degree.
However, it can be challenging in the latter two years to include a broad enough set of modules to cover all interests, so I have had to stick to those "core" modules likely to be found in many degrees, as well as those more specifically related to quant finance and machine learning.
However, it is my hope that individuals will be motivated to look at other areas as well, even if they're not directly related to career paths!