"If you can't beat them, join them" - Goldman Sachs' seems to like this. They started to hate Bitcoin, but I think there are also some reason why they telling it to public before, maybe they are just accumulating lot of cheap Bitcoins before, that's why they intend to spread some FUD and buy cheap Bitcoins.
It's just business. The desire to make money can overcome hatred for bitcoin. If this is not ostentatious hatred.
It is not at all excluded that Goldman Sachs publicly showed hostility and spoke negatively about bitcoin, but they themselves have long accumulated it, as you say. I don't think that in such big and serious companies they don't carefully think through public statements and say only what is beneficial to them. After all, they also understand that their words can be perceived as a recommendation for action and the consequences may not be desirable for them. So when bitcoin was cheap, they said "
Bitcoin is never coming back",
"Bitcoin is not a real asset" or like this. I am always skeptical about any public statements.