There should be, if they chose to withdraw their bitcoins from Gox. But assuming that the article is right, there would be another transaction that moves the money from their private wallet to bitstamp/another exchange as well.

Basically all there is evidence of right now is that the Chinese are buying tons of bitcoins. No evidence of selling/moving as such.

It's not possible to use Gox for USD withdrawals at the moment so I don't think they'll try that anyway.