They are actually (if you compare the ballistic tables) one step down from Hornady Critical Defense (their top of the line man killers), with fancy marketing. So yeah, you are completely correct and if you were actually concerned with zombies or defense you would buy something else.
Why would you buy something else?
Hornaday manufactures several product lines: defense, hunting, target practice, etc... They even have a few self defense lines of ammunition. What they did to make the zombie ammunition is take one of their current existing self defense lines, put it a new box, and increase the cost 20 percent. This zombie max stuff is a marketing gimick. If you were seriously interested in either defense or zombies you could buy the same ammunition for less money.