The submitter account looks a lot like spam to me. No comments, short existence on the site, a few random submissions and everything else about nexmo. Which is

The submitter account looks a lot like spam to me. No comments, short existence on the site, a few random submissions and everything else about nexmo. Which is likely why linking to one specific portion of the API doesn't make a lot of sense. There are several submitted articles like that linking into a subset of the API, probably to get around the dupe link checker.