Just because the pump ejects liquid in a spiral/vortex doesn't mean it isn't a pump!

However, it certainly is an interesting argument that the pressure required to push the volume of blood and blood cells throughout the circulatory system is far too great for the heart. I was also intrigued by the argument about the main outflow artery contracting (as if under vacuum) when the largest volume of flow is traveling within it.

Cowan's video was interesting. Thanks for sharing!