What does it mean when alignment guy says..

[thstone]

It is generally normal for the tires (front and rear) to wear more on the inside edges. This is due to the negative camber settings (top of the tire is tipped inward a little bit). Negative camber helps cornering performance. So there is a trade off between somewhat accelerated tire wear on the inside edges of the tires in return for better cornering performance.

The alignment can be set with less negative camber (to reduce inside edge tire wear) but the range of adjustment on the stock suspension is limited. At that limit, further adjustment of the camber will change the toe setting (which you don't want to happen).

With all of that being said, the tech is saying that he can't adjust the camber any further without impacting the adjustment of the toe.

This could be a result of worn control arms but at some point it is also simply a reality of the stock suspension geometry - we'd need to know what the camber and toe is now (at the best the tech could achieve) and what he was trying to acheive to be able to diagnose further.