I'm guessing GP was referring to the fact that the DRM-free download store is partnering with a "you don't actually own this" streaming service. As long as it's optional, I don't have an issue with it, and the word ironic doesn't necessarily imply that its a negative.
GOG stands (or stood idk) against DRM measures, to which i would count gaming in a cloud with uncertainty if you would get your savefiles if you want to continue offline, therefor your possibility to play a game is bound to being online, etc.
That said, you can still get all your games as offline installer. With cloud gaming they are trying their best to stay relevant / competitive in the market, so good for them. I still buy my games on GOG if it's available, but won't play in the cloud.
Edit: The article states that the DRM-free aspect stays the same and your savefiles will be available through gog galaxy (and therefor heroic on linux)
Devices that you already own (PCs, smartphones, tablets, Fire TV devices, and smart TVs) can become your gaming devices, and Luna also supports peripherals that you already own, such as Xbox One and PlayStation 4 controllers, and mouse + keyboard.
This is the part that interests me the most. I've got a handful of controllers that I've tried using with my phone in the past with not much luck. If they work with Luna, I've instantly got a decent library of games to play anywhere :)