Earlier quoted context omitted.
So is that comparing against plain red meat with no salt added? Because if so that’s not really a fair comparison because you generally add a decent amount of salt to burger whereas you don’t really need to for beyond
I never add salt to ground beef patties, am I unusual in this respect? They taste fine without, especially when you add all the toppings.
If you use an appropriate cut of meat (like ground chuck), you don’t really need to salt as the meat has flavor. Salt will bring out more flavor, but you don’t need a lot.