I would expect some more devices to be ready for Stadia in 2020, maybe it was a copy & paste issue on Twitter? I mean I know that "soon" is a word that can be used for a biiiig range, but I think the goal of Google is to make Stadia available for a lot of persons (e.g. with Stadia base) and also for a lot of devices (other ones than Pixel). Guess it's only a matter of time.