Obviously if you define intelligence as "successful" than intelligence correlates with success. That's a circular void claim.
My point is if you look at Intelligence and assume they should be more successful with more IQ you need validate the IQ test to verify it's still valid at the outer edges. But, if you look at the most successful people and find IQ > 140 to be vastly more common than the general population then intelegence unlikely to be actually harmful.