I said for the region. For example, manufacturing hourly wages are literally over twice as high in China as compared to Vietnam. Pay is even higher in most of the EU and in US/Canada than in China, but manufacturing at the volumes Apple needs mostly wouldn't work well there anyway because the supply chain and labour force just isn't sufficient. Pay for manufacturing in China is higher than in Mexico though. Mexico also has lower worker efficiency.
To summarize: Labour costs in China are cheaper than in the US, but are higher than many, many other countries including Mexico, and much higher than other countries in the region. However, the even bigger issue is the skilled labour supply and the supply chain, which simply is inadequate in most countries including US/Canada and the EU.