The idea is simple in theory but I don’t know in reality. However the potential is good.
The idea is to stream games from Internet Servers to the TV with the mobile as a go between.
You buy the streaming ready game on the android phone and use it to stream it to any TV you like. Provided it has a chromecast or the like.
Even if a game requires 8GB of RAM. Streaming should not take anything like such requirements. The limiting factor should be if you have enough bandwidth and latency for the resolution.