Yes, sorry I should have been less terse: never heard of antidotedb but I figured there is probably a bunch of these projects mature already. I was asking, not stating.
AFAIK Erlang isn't byzantine fault tolerant, doesn't use CRDTs, and doesn't even have a JSON library in its stdlib. So just from the title you can tell it has nothing to do with the article.
Could you elaborate? How do you get CRDT's for free in Erlang?