It is normal to see a businessman or a company change heart if it benefits them.  We have seen how JPM disapproved of Bitcoin and later found out that they are creating their own cryptocurrency.  So having this kind of news about JPM Bank changing tone and actively supporting Bitcoin now is no news.

They have seen that supporting Bitcoin and other cryptocurrency exchanges will give a boost to their company in the cryptocurrency industry so they will do it even if they have to eat their own word, that is how business goes.  Profit first.