It says they use UTF-16 (just like Windows, Java and .NET), which represents code points outside the basic multilingual plane using a pair of 16-bit values and

It says they use UTF-16 (just like Windows, Java and .NET), which represents code points outside the basic multilingual plane using a pair of 16-bit values and is thus capable of encoding the whole range of code points. The blog post author happens to confuse the terminology, but UTF-16 is sound.