Being smart isn't enough, you have to be wise. Intelligence can help you climb to the highest positions in business and academia, wisdom allows you to understand that it isn't really worth it.
Yes and even more because "intelligence" alone doesn't even help you climb to the highest positions. People, especially on forums like HN, tend to mistake being 'intellectual' to actually 'intelligent'. There are various ways of being "smart" and being good at math and code is only one of them (Emotional intelligence, relationship intelligence, intelligence in career) etc... People who say 'Iam so smart' are usually…
The thing that is a main driver to "climbing to higher positions" is usually desire and motivation, which is a cultural trait. Intelligence has a high correlation because there are plenty of motivated people across all levels of intelligence, so highly intelligent are better at succeeding at such well-defined problems.
Smartness is sometimes about well-educated or simply experienced and knowledgable. Eg. even if I was more intelligent, I'd trust a medical doctor because they have a vast knowledge and experience that I lack.
Still, the article makes a nice distinction between well- and poorly-defined problems. It's definitely going in the right direction, so go and have a read!