Well, let's not get ahead of ourselves. A mixer is an analog circuit, and silicon carbide is an expensive substrate to work with (very high processing temperatures), so it is typically only worthwhile for high-power analog devices. There is no discussion about anything digital in this article, so this is not related to programming languages or computers. Many analog devices have been made beyond 100 GHz on plain old silicon too; graphene on SiC may be important by enabling greater power density at high frequencies.
As a microwave engineer, I'm excited about this, but this needs to happen on an inexpensive IC process for very small devices to be useful for digital circuits.