I think that was a joke, half the post is hand-drawn stick figures after all...
Lots of lower tier CS programs like mine seem to really just focus on popping out Java programmers that can work on enterprise systems. Probably 33% of my graduating class fit that bill and went to work on low importance systems at a local bank.
Even in higher-quality ones, OS (and thus syscalls) may not be covered if the curriculum focuses mostly on, say, computational science, or PLT, or formal methods.