That's a question for Philippe next time I see him.
The result sounds yucky: strong alcohol and residual sweet grape juice. When locusts move on, they leave nothing behind
The time of harvesting of course has an effect on sugar levels. The later the harvest, the higher the sugar. Apparently harvesting is being brought forward earlier to avoid wines being at 13-14%, which most people don't want as table wines. When locusts move on, they leave nothing behind