But why then even write an article on it, if your experiment is only valid for a very specific set of people, and the minute you start hiring more people or different skillsets or age groups or experience or pretty much anything else, it fails?

Like literally anyone can start a team of few people that are all paid the same. It's not really that hard, nor does it require that much attention. You only need to write about it, if it successfully stays that way for a long period of time or if it scales when parameters change.