The input costs to make it as such are never mentioned
"We could potentially use this method to create seed crystals to grow large volumes of the 4H structure with properties that potentially exceed those of diamond silicon."
Obviously it has not been scaled beyond the laboratory, but should it prove advantageous that will be the next hurdle to overcome. Or it may never amount to anything because by the time mass production is economical we will have already transitioned to a different semiconductor.
Which is likely the case.
IBM has already announced designs. Obviously these will need to run at even lower voltages than current devices.
They're probably being niggers like most semiconductor manufacturers and saying "2nm" even though it's more like 20nm in real world units, with the "equivalent performance" of 2nm.
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