He is speaking of the minor window of adjustment for alignment purposes that lay within the factory design of the rear control arms. For which lifting the vehicle was not taking in to consideration. The extra camber adjustment needed can be achieved by their installing ''camber bolt'' kits (ones made and meant for this car from the aftermarket) on the strut to spindle mountings of both rear corners (before its being realigned).
That being said (and this is no amount of hyperbole), Firestone is where fools, their money, and their vehicle's sanctity all go to part ways from one another. There is not a one in the nation that represents an actual automotive repair facility. The fact that they boast having so many ''technicians'' in their commercials, that is also a number less than the total amount of locations they have in said nation is massive red flag number one. Your car actually driving straight after the high school dropout they will never pay enough or properly train to touch it is going to be pure coincidence.
DO NOT go to firestone (or goodyear, bridgestone, cooper tires, etc etc. for anything other than tire installation/un-installation. And take with a huge grain of salt the quality of even that simple work that you will receive at that.
I am not saying this to be an elitist or anything. I have spent the whole of my adult life in every level of this industry.
Also, lifetime alignment for $170 is also the funniest thing I have heard all month. Thank you for giving me that.