While I generally agree, I think for many people it's easier to cut 10% of their annual spending instead of getting better return rates or a salary raise.
That's the sad thing though. While many people do spend their way to poverty, personal finance people almost never seem to address the question of how to negotiate/strategize to get more money in the first place. A lot of people semi-rationally conclude that the way to make money is to look successful by driving a new vehicle, wearing nice clothes, and 'fake it til you make it.'
It varies widely by person (some people are addicted to spending money), and by career (bumping salary up by a few percentage points is a lot harder in some industries than others), which is part of the problem
I think there's a distinction between out of control spending and someone with decent expenses. There definitely is no shortage of those with all the streaming services and a new iPhone every year, and less than $1000 in the bank, but I think that's not the portrait the article was trying to paint.
Additionally, the article does point out that you may need to reevaluate your career and/or create a side hustle.
It is "easier" for people that are capable of becoming wealthy to do so by making money and leveraging their skills to accrue wealth not by hours worked.
It is unclear weather it is "easier" for everyone to do so, or possible. And if not, whether they are better off not trying, and instead saving and budgeting.
Maybe (depends on your income and what expenses you currently have). However for many, pouring that energy into an income-creating task will create a larger amount.