That's the unfortunate reality with a lot of Substack type newsletters.
The real world truth is often so boring and simple that it can be summarized in a short blog post. Want to get promoted? Work on important projects for the company, build rapport and relationships in the company, build a reputation for getting things done on time with high quality and low drama. You'll either get promoted, or build a foundation upon which you can pivot into a promotion at another company.
That's boring to read, though, so much pop-business advice turns into ego-stroking stories about how the reader is morally superior to all of the other unprincipled ladder-climbers around them. There's a large appetite for stories about how the world is unfair, and there are many writers happy to deliver those stories.
I'm part of a mentorship program for junior developers. These kinds of articles have been detrimental to a lot of impressionable young people who are growing up convinced that the world is thoroughly corrupt and therefore the only way to win is to become corrupt yourself. In reality, if anyone finds themselves at a company where people are promoted based on lies, nepotism, and general corruption then you don't want to get promoted there anyway. Get out while you can, because any company that rewards people who play games over people who deliver results is doomed to go downhill. In the real world, the good companies really do identify and promote those who consistently deliver results.