Both parts are factually incorrect. With the exception of the recent bubble, there are no price run-ups on record that qualify as bubble.
He also suggests, incorrectly, that every inflation is a bubble. What has attracted your attention to this cr-p? The author presents no new factual information, referring only to a "floated" media articles, and no economic analysis. What he does say is completely incorrect and grossly misleading (as is common on MarketWatch). What has attracted your attention to this article?
Here is an economic analysis:
China’s property bubble
Takatoshi Ito 15 April 2010
One objection to the calls for China to let its currency appreciate argues that the yen’s appreciation during the 1980s was a cause of Japans lost decade. This column instead blames policymakers for not dealing with Japans property bubble early enough. China should learn from these mistakes with its own property bubble and let the renminbi appreciate.
http://www.voxeu.org/index.php?q=node/4885