The term "predator mindset" was specifically selected to contraindicate a "prey mindset". I am guessing that the people who are taking a trip down pedantic lane have not actually read Rory Miller's texts.
Yeah, my take on it was that it was about not being reactive but going over to the other end of being proactive and assertive. Kind of like the Jigen Ryu guys training to start screaming at their opponent as they beat them to death with their swords. Train to take the initiative, take over, dominate, then get the hell out... I got what he meant but I do think the word predator carries too much baggage for the casual reader. Shrug. Decent book as I remember it.
Reminds me of things like sensen no sen, actually. Well, kinda, sorta...