This is how they foresaw about the future of Bitcoins, that's why their government is one of the official supporters of bitcoins around the world. as of today, the price is far from what they speculate after halving but base on the past history of its halving, there wasn't a single time the price was fall. everytime the halving comes, the price has successfully risen in a reasonable amount. I think what the german bank predicts will have a higher percentage of becoming true If there will be no sudden change in the flow of the price starting today.