The person who posted this is an idiot, its just flaimbait. Silverlight is still a brand new technology.
They released Silverlight 1 about a yaer ago, which only supports javascript and which is basically just a precursor of things to come. Silverlight 2 (which supports the .NET framework) just reached BETA in March, and will have its final release being said.
Given these facts, why/how would/could they instantaneously transform all of their webpages to a beta product? It has nothing to do with what they "like", its just business.