They mention there were only 120K downloads. It may be true that bitcoin people are early adopters, but those early adopters aren't using wallets downloaded from the app store. For comparison December 2013 saw 3 billion total app downloads. Early adopters of iOS bitcoin wallet apps are a fraction of a fraction of a niche right now.
A) Bitcoin is not as big as you think, yet. 120K downloads is not that bad.
B) Since Apple is so hostile towards Bitcoin, many people have switched to better alternatives and simply don't care about Apple's private North Korea with an insane leader.