There is no such myth that I'd be aware of, and I seriously doubt the author behind this would be operating under such a misunderstanding either. Maybe you used to at some point, but then that's a separate issue.

Propagation is just an incremental spread across a topology. Doesn't need to be a physical topology whatsoever.

It may seem like this program suggests a physical propagation as far as its elevator pitch goes, but one glance at the readme clears it up pretty quickly that that's not actually the case.

Changes do propagate, and seeing funny blinking lights on a world map is cool. Doesn't mean there'd be an intent to convey the process as a geographical spread.