The title of that article is kind of weird. It's just wrong to claim they are dead for gaming because of a lack of steam.
Anyone can just get Witcher 3, Rise of the Tomb Raider, Stardew Valley, or Anno 2070 from GoG and for each of them you can game for another 50 hours without needing steam. Or get Minecraft from their page directly and play for 100 hours. This is all without going to any retro titles.