Given the graphic on the top a chip with 8 GByte at 77mm^2 I have no idea where they're getting the "Terabyte on a chip" thing. Unless the mean a Terabyte on a 200 mm die?
FTA: "The company can put a terabyte of data, or about 250 hours of high-definition movies, on a single chip that is smaller than the equivalent flash memory chip (as pictured at top)."