Different manufacturers have different definitions
A lot of VA's you see around are in fact wavetable-based to get around aliasing. A true definition of 'analog modelling' is to simulate with DSP algorithms the actual process of an oscillator making a continuous waveform, for example. This is much more resource-hungry than the wavetable approach, so quality is often sacrificed for polyphony count.
A bit strange though as most of the best analog synths had very limited poly.
peace