I'm A Little Confused...

I was just reading the Executive Summary of the Coalition for Columbia's Downtown.

It calls for 20% "of the lot area of each individual parcel be devoted to public open space."

Existing New Town zoning requires that 36% of the land be dedicated to open space. Are they suggesting that the amount of open space in Town Center be reduced?

Or are they suggesting that an additional 20% on top of the 36% be set aside for open space in Town Center?

Or is this simply evidence that they are clueless?