To me they look like a bullet that is trying to use a blunt Keith style profile but moving it back towards the middle for a more streamlined bullet profile upfront.
Maybe it works to some extent or maybe it’s pure gimmick? I can’t imagine the “cutting edge” cutting due to sharpness so much as basic blunt impact of any high speed projectile going through tissue.
I have no idea if that’s the case or not but that was my impression when looking at the bullets in the link provided.
