A couple quick searches and a skim read, they’re offering their technology under their main brand Touchstream as well as another called Shodogg. It’s not the same as Chromecast of course, but as the patent holder they have a right to market the technology as they see fit.
I haven’t looked at the patents themselves, but I reckon it’s a bit more involved than and significantly different enough to a simple remote procedure call. It’s not like a server delivering video to a client, instead it’s switching from displaying on the server to the client. RCP is initiated by the client, while casting is initiated by the server.
This really seems more like Google trying to get away with not paying an inventor than an inventor sitting on their patent and denying society the fruits.