It's about moving from developing to marketing. There's nothing wrong with that, but it was a let-down to me to discover that the path to riches meant mingling with the group of people I tend to like the least in a company.
Also, I think it's fair to say that amongst departments in companies, marketing is much more likely to pay (and pay a lot) for a consultant, whereas IT is only likely to pay a lot for outside help when things are really, really desperate.
Marketing is seen as revenue generating, and at many places, IT and (ironically) product development are seen as cost centers.
This might as well have been an article about how to 100x your income by moving from your current job into a similar job in a fintech company. That's a bit like moving from serving tables at Denny's to Del Frisco's steakhouse. Most Denny's waiters are not prepared nor capable of making that transition.