quote from that microsoft page: "Much of the NGSCB architecture design is covered by patents, and there will be intellectual property issues to be resolved. "
this is why that thing is not used much, patents = either increased product costs for manufacturers or exposing themselves to lawsuits.
the only devices that i know to use it are the game consoles, XBOX, PlayStation and the like, but those are relatively closed and isolated ecosystems where competition in hardware is non-existent, e.g. the only way to get an xbox motherboard is from Microsoft. Same thing is for Sony and playstation motherboards.