It's perfectly clear that they mean defending one's land against people who want to take or despoil that land, not just people who come on to your property to rob or assault you. You're being disingenuous.
The numbers they present are so small that the farm murders in South Africa would significantly change the picture. As I wrote: they include "killed by criminal gang" in South America, and as far as I know, the farm murders are generally committed by criminals in search for loot.
It's sad that you can't mention South Africa without somebody showing up and implying that you are a white nationalist and completely avoiding to engage with the argument. Well, such are the days, I guess.
Genocide is an organized attempt to drive a race to extinction. An effort whose stated goal is to kill everyone of European decent residing in South Africa would qualify as genocide.
Genocide is not just any large-scale killing. It's certainly not the seizing of property, regardless of scale.