That does not mean it never happened, we just can't find the source. I had this with my own statements in the past too, sometimes it was true sometimes I was wrong. Therefore I cannot trust everyone in the internet. What I can imagine is, that GOG worked on the GOG API (the programming interface for other tools) to add access to the Cloud features in example. It might came out of a request from the Heroic Launcher project. So in a sense GOG would cooperate. But this is just speculation on my part here.

Still the Heroic Launcher is a separate project doing all the work on their own.