Wait, did anyone actually hope for the actual story of the Bhaalspawn to continue after the way BG2 ended?
Now that I give you the source you wanted you throw another question? I'm just answering what you wanted. Does this game's story has anything to do with BG1 and 2? Answer: No
Errr... just because it's not a direct continuation of that story does not mean it has nothing to do with that story. I fully expect certain characters from the original BG games to be there (one of the things that were claimed to not be there by mr "much intellectual resources") and I expect the current story to be heavily influenced by events from those games. If you had different expectations then I'm afraid we've had a miscommunication...
Well,the fact is that he said the BG1 AND BG2 story is closed,the game happens 100 years after that,and Descent into Avernus is it's precuel. I said nothing but there'll be characters of the previous installments on the new one. I don't see how that adds so much weight to what you're trying to prove.