Dramatic, and makes broad unsubstantiated claims about API's "in the wild", but the details are right. His most important point that we as API writers can work on is the "discovery" part. Hardly anyone is doing HATEOAS [1]. I think the reason for this is that if you write a public API, you're going to document it well (or nobody will use it), and good documentation kind of alleviates the need for in-service discovery.
[1] http://en.wikipedia.org/wiki/HATEOAS