I read it like he says that the 18w Zacate will be obsolete if there will be a 20W Llano with those specs listed. But, first, these are TDP numbers, Llano might be at 19W max in real world, while Zacate might be closer to ten. We can't know for sure. Besides, I think it's possible that the thermal margins in the calculations are a tad higher for Zacate.
And then the most important thing, a Zacate 18W will be lots cheaper, probably more like an Atom. While Llano 20W will be more like an ULV-part.
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