It's not to be taken literally. Someone might offer you some dessert and, if you don't accept, say "no one ever died from eating some sweet dessert", but that's not a claim that literally no one ever died from eating sweet dessert. I'm sure more than one person choked on it and died in the history of humanity.
It doesn't mean that, it means "very very few people get rich working for someone else".
Very few people get rich period. Many more get to the upper middle class, say the top 10-20% of income. And the vast majority of those do so by ordinary employment, not starting a business.
If we go by the numbers and the odds rather than pithy-but-misleading slogans, the easiest, safest path to a higher income is probably acquiring skills that are more rewarded in the labor market.
Which is still far from easy, but there is no easy way to make a lot of money. That much I agree with the article writer on.
It doesn't mean that, it means "very very few people get rich working for someone else".