that is the definition not the "killer app".
a "killer application" is something that can prove the core value of bitcoin and help with the adoption of it. for example things like Open Bazaar can be considered a killer app in my opinion since it is proving the power of decentralization, having your own shop and being in full control of your finances without needing a bank and with no fraud such as charge backs that the traditional payment processors have. but since it is hard to use for regular users it has not yet done it.
Yes, I think you are spot on with this nominee, just a pity Open Bazaar has not gone viral yet, then it would have been the ideal candidate for this award. Open Bazaar has gone up against giants like eBay and Amazon and it offered Bitcoiners a decentralized alternative that cannot be taken down.
We need disruptive killer apps like this, that will take on the "David vs Goliath" fight and won and it must go viral. There can be more than one reward too, for example : The Killer Bitcoin App or Game of the Year / Most Innovative / The Most disruptive etc.