Would you say that the Bristol sounds aren't accurate, then?
I don't know how accurate any software emulation of an analog synth is, but if you have the layout of the unit there in full; it stands to reason you're emulating the circuitry logic at the very least.
So the number of VCA, VCF, ADSR, the oscillators & all those derivatives.
With real analog hardware the exact same models' sound can even vary depending on the years due to the components changing.
You see guitarists argue about this with a Marshal JCM from one decade to the other, and it can come down to the provenance of the tubes.