The article appears to start with a very similar assumption, and proposes use of URLs within resource representations instead of bare foreign-key IDs. I don't think the article can be accused of systematic ignorance of 'standard practices' or failing to perform "cursory bibliographical research"; stuff like HAL and JSON-LD are far from standard practice.
This series may benefit from a quick comparison of API design schools, comparing ways to express the a similar domain model in various styles, but it also seems to be trying not to get bogged down and dispense some prescriptive advice (instead of, say, overwhelm and despair).