They mentioned this in the article, but I'd say it has a lot to do with image.
Boston Dynamics seems fixated on posting videos of people abusing their robots to demonstrate their ability to regain balance, but the general public finds them pretty disturbing and are easy fodder for late night comedy jokes about robot uprisings.
Not really the kind of visual you want to put in people's minds when your company is simultaneously developing AI that was broadcast besting a human at the world's hardest board game.
No short term ROI + product milestones in the form of creepy videos = Google's black sheep