The author took way too many words to say message passing between processes is a more grokable form of concurrency than callbacks. Then goes on to say that Node is less grokable than Erlang because concurrency in Node heavily relies upon async/await which is just pretty callbacks. There are some weak analogies to the importance of data structures mixed in to the text which aren't helpful.

I think BOTH models of concurrency have their uses. The only problem I see is not being able to apply the appropriate one at the appropriate time because the language doesn't support it.