The description got me excited, but looking at the table of contents, the level is ultra basic - appears to roughly correspond to first year of a cs degree.
Certainly more than just the first year, and I don't think the majority of CS degrees require multivariable calc or any group theory.
I do wish there were more of a preview than just the TOC to see how novel the examples are and how much it helps with intuition for these mathematical concepts beyond what you would learn in a plain CS sequence. That would be my reason for buying the book and I wouldn't write it off just because the list of topics covers the first two years of college math.
My uni did this weird thing where they put all the math courses into the first year (except for one stat course in the second year). The first semester had highschool basics like calc and trig, followed up by another two courses the following semesters that covered linear algebra and ... something else. I don't remember, I because I was too busy with girl problems.
Looking back, that first year was brutal with each successive year getting way easier and way more fun.