You answered your own question already. Lowering (or raising) a car changes it's camber showing that camber does indeed change as the suspension does. Your problem is that you are looking for this mechanical action to take place when it is simple geometry. That's where there are upper AND lower control arms. Their offset determines the amount of camber change happens. It is the vertical equivalent of bump steer.

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~2003 X5 4.4i~