ISIS has some “action”:http://www.isis-online.org/publications/southasia/India_18September2008.pdf on centrifuge-related blueprints that were obtained from India for cheap. The institute also “responded”:http://www.isis-online.org/publications/southasia/India_DAE_19September2008.pdf to a related press release from India’s DAE.
Bottom line: it doesn’t look like a blanket denial.