The measured caster angle of each side by itself is irrelevant, even though one or both sides may be out of specified range. The relevant value for tracking stability, pull, braking stability and other steering issues is cross caster. I don't know the spec. for B7s, but the specified limit for cross caster for B4/A3/A4/A5/A6 is 0.5 degrees and I imagine the B7 would be about the same. Yours came out at less than 0.25 degrees. VWs (and most other manufacturers of McPherson strut front ends) have been depending on manufacturing tolerances alone (i.e., no adjustment) to produce acceptable cross caster for many years over many different models without apparent problem.
Your argument that VW should be faulted for failing to meet its own specs. would have more weight if there was a detrimental consequence to that failure. In the case of the caster absolute value (NOT cross caster), there is no real consequence in pull, tire wear, or steering feel as long as cross caster is held to spec.
Having said all that, don't forget that accurate and repeatable readings on an alignment rack are dependent on the skill and dedication of the technician, the condition of the rack, and the frequency with which the it is checked for calibration. Just look at a typical alignment printout and note the variance in a non-adjustable angle (like caster in this case) between "Before" and "After", when presumably nothing has changed on the vehicle or the location of the alignment heads.
You should PM experienced alignment technicians like Oilhammer or Matt-98AHU and run this issue by them, then post their feedback.