Senteria: Step 1. GOG adds game with description given by the developer.
Step 2. People bring attention to GOG that the advertised features are not there
Step 3. GOG removes the advertised features in the description as they are not going to be there.
Step 4. People who feel cheat can ask for a refund and gog most likely will refund
Where's the problem? Should GOG write a big blue topic for every mistake they make? No, they don't need the negative rep and prefer to solve the issues internally with the customers who feel are cheated on. As it stands today there's nothing wrong with the game's description.
Anyhow, did the OP contact customer service and ask if a refund is appicable? If not, you can't say that GOG did nothing for it's customers.
You are mistaken on step 1, 3 and 4.
1. GOG does not have the luxury of falling back and blaming its suppliers for a problem its customers experience with a product GOG sell.
3. GOG should be making public announcements that they fucked up.
4. GOG should be proactively contacting customers re 1.
In short, quality control.