Surely they could have sourced such an investment domestically?
As the WSJ article implies, CSC may have certain motivations that a domestic LP wouldn't, such as a desire to get capital deployed outside of China. And fast.
Personally, this looks like dumb money hoping AngelList can turn it into smart money. It could very well distort market for early-stage startup investments, but it isn't likely to change the way these investments tend to behave in terms of returns.