Fluid damper of the tonearms is of course different from the turntable suspension dashpots.
Reading the 30/2 manual makes it obvious that the turntable’s dashpot damping increases rigidity. Less damping by their “up to 2mm” recommendation will make the upper subchassis less rigid, providing for an increase in isolation for severe situations.
More critical thinking reveals that damping does not equate to isolation here.