Both absolute and relative volume displays are the same. They are both a scale from min to max. 0 to 100 is the same as -100 to 0 is the same as -80 to +20.
I don't know if you are correcting my statement, adding additional information, or what.
A volume control calibrated in Db has some meaning. A change of 10Db indicates a rough doubling of volume. I assume that's one behavior of the calibration on my Yamaha, I have not tested it against a SPL.
A scale of 0-100 means nothing. It could have linear response, logarithmic, response, heck it could have fibonacci response...no way of telling. A change between 0 and 10 could indicate half the receivers max power, once again, we have no way of knowing. We could guess that 0 means no output, and 100 means maximum (unlipped) output when the input signal is at some RMS voltage, but we still don't know how 0 and 10 relate. That's all I was trying to indicate when I said 0-100 means nothing.
Let me know what you were trying to correct me on, I am certainly always willing to learn.