Nope ... there are a ton of 30-somethings writing "easy" advice like this and bemoaning the ignorance of their twenties. I'm a few decades older yet and can tell you that I'm still learning and integrating new ideas into my framework of how business (and the world in general) work. Creating a simple idea is easy but think about how many counter-examples there are to just this one rule (and you can find 100k more simp…
I think they're well intended and can be useful to think about but beyond something like "these are useful things to be aware of or to keep in mind" it's hard to apply things in life.
Perhaps it's reading too much into what's intended by the authors of these sorts of pieces, and maybe they're just trying to communicate some help, but this particular piece is "advice about advice" so in that regard I think these issues are relevant.