I'm surprised by your ignorance and hostility. Your tone is not acceptable.
Regarding your assumptions. Just look at what you wrote:
and compare it to what you quoted:
I emphasised the relevant part.
And even aside from this wording, it can be understood as being pretty much standard that boxed copies of games, including the ones actually sold for this game in stores (!), include Steam keys nowadays, if the game is also generally available on Steam. A digital copy would, on the other hand, typically be understood as a "PURE DIGITAL" copy, bought online and retrieved purely via the same means. Whereas a boxed copy would typically contain a box, manual, dvd. In cases where the game is available on Steam, the copy would typically go along with a Steam key, often printed on the back of the manual. This is generally the case and we were given no indication from the description or what is written in the backer portal that we would not be given the opportunity to register the "2nd copy" on Steam or GoG. I hope you understand the issue now.
I actually came here to thank Obsidian for resolving this issue for me in a very satisfying way after I had contacted the support and explained them my issue. I am entirely happy now.