The original article, by comedian Andy Borowitz, is titled "Amazon Founder Says He Clicked On Washington Post By Mistake" and included a series of gag references that will be familiar to anyone who ever purchased something online, which is relatively common for urban middle-class Chinese.
As of early this morning, the story was still up on Xinhua, as well as People's Daily Online and China News. The ever-sharp China blog Shanghaiist, which first reported the mix-up, captured a screen shot just in case Xinhua wises up.
This is not the first time that Chinese official media have reported a highly satirical American news story as fact. (Satire might be popular among Chinese citizens, but apparently not in the editorial offices of state newspapers.) In November, People's Daily Online breathlessly reported, as fact, a story in the Onion declaring North Korean leader Kim Jong Un to be "the sexiest man alive" and "every woman’s dream come true."