Not sure what numbers doma is using. Here's wikipedia, which confirms that China has been purchasing less US debt recently.
"As of January 2011, foreigners owned $4.45 trillion of U.S. debt, or approximately 47% of the debt held by the public of $9.49 trillion and 32% of the total debt of $14.1 trillion.[64] The largest holders were the central banks of China, Japan, Brazil, Taiwan, United Kingdom, Switzerland and Russia.[66] The share held by foreign governments has grown over time, rising from 13% of the public debt in 1988[67] to 25% in 2007.[68]
As of May 2011 the largest single holder of U.S. government debt was China, with 26 percent of all foreign-held U.S. Treasury securities (8% of total U.S. public debt).[69] China's holdings of government debt, as a percentage of all foreign-held government debt, have decreased a bit between 2010 and 2011, but are up significantly since 2000 (when China held just 6 percent of all foreign-held U.S. Treasury securities).[70]"
Also, it is worth remembering that the US also holds debt from other sovereigns. Not sure what the net debt position is, but perhaps this is what doma is thinking about.
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