Not excusing the editor/writer of the article for anything; that was a low trick to get readers.
Doesn't the CAP theorem  say that consistency, availability and partition tolerance cannot be achieved in a single system? How is Datomic giving us consistency, transactions and scalability? What are they sacrificing? How are they getting the 'best of all worlds'?
Assuming hot failover, it's a perfectly reasonable approach for pretty much all places a traditional SQL database was reasonable before.
In theory it should still be able to handle at least the same write load as a traditional db whilst offering more flexible modelling and distributed queries.
He's just mentioning the work some people have done in the Clojure community to get Clojure running on Android (with performance/startup issues)