A "Biden confidant" is irrelevant.
The party platform is non-binding. I took those points from his own words. Of course, Joe Biden is not binded by his promises either. But therein lies your true sentiment and many progressives... it doesn't matter who spoke at the DNC or its platform... it doesn't matter who he chooses as VP... it doesn't matter what he himself promises... so progressives need to stop pretending like they "would have been" persuaded by any of those moves and just speak plainly: they won't support Joe Biden because he is Joe Biden.