The guy is a dumbass
You don't need a camber kit with the Tein springs. I had my rear slammed with Tanabe coilovers and the tires wore out evenly. The tires are gonna be tilted inwards a little bit, but it's not gonna wear out your tires prematurely. Having them tilted inwards gives you better handleling. Plus the stock camber can be adjusted
What I would get would be new struts if you have a lot of miles on your stock struts.