Maybe there are other factors besides just money. Like the fact that wealthy parents can afford invest more time into their kids, they have less financial stress so can focus more on parenting.
Also having a successful person literally raise you from birth would probably contain a lot of lessons about sucess
I think assertions like this miss alot because they automatically assume the wealthy parents helped them financially. It seems to feel of sort of idolizing of money, thinking money can solve most problems and achieve a great many things. I think that's a popular but flawed belief.
As someone who started a moderately successful business in the past, I don't think just having money to pour into a startup is as important or as deciding a factor as people think