A lot of the math in the notes are not covered in the standard engineering mathematics curriculum. Chapter 1 is not. No one taught me about rings except in discrete (just briefly), and the next time I visited it would be in algorithm and cryptography class. I honestly cannot recall my exact curriculum, but a quick glance at the table of content, more than half unknown to me.
Now, different school, different teacher will have additional materials. That's possible. Most importantly, the author of this PDF created this for the CS students, so it CAN be in the title.
Schools usually have two or three abstract algebra classes just to cover materials in Chapter 1 and a couple later chapters (polynomials, modules, etc).
Not really (though again I emphasize every school is different). At least my school doesn't teach these abstract algebra covered in Chapter 1 except in discrete mathematics, which is not offered to most engineering students.
Sure some axioms, vector spaces, some polynomial, logic, here and there would be covered in calculus, differential and linear. But large part of the content would not be part of a CS/Engineering classes. Only what is relevant.
Now, different school, different teacher will have additional materials. That's possible. Most importantly, the author of this PDF created this for the CS students, so it CAN be in the title.