After all Goldman Sachs are the bankers which are drastically against Bitcoin and all cryptos. So why do you believe in them when they're talking about their enemies, of course it all will be a bad words and bad predictions.
Actually, I've read many of their predictions and most are spot on...including this one.
FYI, they manage cryptocurrency for BIG clients and considered as one of the "whales". Will they use that to their benefit? I bet you, but not as underhanded as others so far (or as far as I can tell).
Most times, people just misinterpret what they read (as in this case with you). Have an open mind and you might understand the real message.