We have to realize that it's a bank saying those things. Bitcoin and other cryptocurrencies threaten the profits and the very existence of banks, so of course they're going to speak against their adoption.
As for being in a bubble, that's a debatable point. From a certain perspective, we can say that they are not in a bubble. In fact, the continued growth of cryptocurrencies indicates that they are still UNDER-valued.
On the other hand, all fiat currencies are definitely overvalued, and part of a worldwide money bubble. They will crash / burst before cryptos.
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My thoughts exactly.