It's hard to believe stories like this. It could have been staged by the owner to run away from obligations (i.e. taxes). Who would really store a huge amount on their mobile phone? And to say that he is a security expert makes it even worse. If it were true, did he really asked for the miners to rollback?
Sounds like bull, someone would need to be a Billionaire to be that careless with $45 Million on a cell phone. Stories like these make people worry about BTC, when it is actually still safe.