No, this isn't what the author is talking about at all.

Yes, the OS is happy to preemptively schedule time between processes, but this is talking about languages where there is one thread per process, and "doing more than one thing at once" in those languages is done with async/await style language patterns rather than spawning threads within the process and using things like semaphores, mutexes, monitors, locks, etc. to control execution flow and access to data.

J.Ja