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)