If the original rubber parts are still on the car then I would expect them to be on their last legs just from an age perspective.
Even so I get the feeling that the biggest trouble you are having is believing in numbers - I can't tell for sure but it could very well be a case that the operator of the machine should RTFM.
I reckon you need to do some checks of your own so you can judge whether they are doing the job properly or not. Measurement of camber is quite a simple thing to do - either with a "bought at a shop" camber gauge - or with some bits of stuff that you are likely to have in your workshop =>
How I adjusted the toe in / out, camber and caster on my W123 300D
You might be interested in this thread where it turns out that some of these fancy alignment machines need to be "swept" before they give the right number =>
1983 240D WHEEL ALIGNMENT (new purchase)
Sorry wrong terminology - you need to sweep the wheels - I don't know what that means. I do my own alignment and suspension adjustments.