I don't think so. One measures/calculates displacement based upon displacement of the boat, not displacement minus or plus ballast.
Specifications are generally based upon the design displacement and not as built. It's not uncommon to see as built being heavier than as designed; add to that the 'stuff' one brings onboard you get a considerably heavier boat.
I realize that this is an electric boat group and not a sailboat group but the fact that a boat may be considerably heavier than as designed has some repercussion related to the sizing of the propulsion unit, be it sails, ICE, or electric.
As a side note, I always ask the lift operator to give the reading when my boat is hauled and have found that they often are not terribly accurate and that the operator will tell you such if you get into a discussion. Their concern is only that they are not beyond the lift's capability.
eric SV Meander
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