Sure. The whole (Penryn) design (which Silversthorne is an integral part of targeted at ULV) is designed from the ground up - so the statement is perfectly in order.
Although it is not said Silverthorne is a design independent from Penryn, the pictures (strongly) insinuate this. These pictures are in order as well: Intel can make Silverthorne from wafers as pictured.
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