" The term "printing money" often refers to a situation in which the central bank is effectively financing the deficit of the federal government on a permanent basis by issuing large amounts of currency. This situation does not exist in the United States."
http://www.federalreserve.gov/faqs/money_12853.htm
Perhaps they are lying about what is really going on but I think transparency is of primary importance for the functioning of the bond market and I'm assuming they aren't lying.