Right, the spinorama is a model based on theory to interpret the raw data (or convert data to information). This is subjective to the extent it not does not include all dimensions that affect sound quality, such as SPL capability and distortion.
The spinorama is nothing else than measuering the spl at many points at many frequences.
No model, no theory, nothing subjective.
Nobody said its something else....than highly informative data that can be usefull for people that understand the usefullness of that data.