According to a Valve Engineer, the Steam Machine specs outclass the most common PC configurations. The company relied on its own hardware surveys to choose the system’s components. Even as an entry-level option, Valve claims that 4K/60 fps performance is realistic, despite a memory-limited GPU.
Except its not misleading, as they’ve straight up said you are free to install any OS you want without restriction. So its true, you can play any game on it if you want.