I suspect the parent comment is primarily referring to Riak Core, which was another layer of abstraction above Erlang’s OTP for distributed processing.
Riak the database used Riak Core, but it could be used independently of the database.
I hadn’t thought about Core in a long time, I should take another look.
Looks like someone is carrying the idea forward: https://riak-core-lite.github.io/
IIRC it was a few years after the dynamo paper came out, and at a time when a bunch of other nosql+high scalability solutions did (e.g. Cassandra)