That was for 10 days in September which happen to be the 10 days including launch day. I would venture to guess that the iPhones largest sales are within the first week or so of launch. The next few months will tell the true story, IMO.
I read the article which is being referred to.
The author disputes true statements about worldwide trends in Android adoption by citing a single data point which is restricted to a single market.
As you say, we need several data points in order to establish a trend.