Similar title: A brief course in modern math for programmers
It does say "This book is not for mathematicians" — or the nit-picking historians of mathematics I imagine... Plus one should not judge a book by its cover or anything written thereon.
Why not? The cover and that things that go on it are as much a part of the book as any other page.
This saying is so outdated and comes from a time when all book covers were essentially the same.
"A bit of linear algebra, calculus and probability/stats" would make you better equipped at leveraging LLM? Or do you mean that having "a bit" of those you would be able to implement/train you own custom LLM to write code for you?