With regards to success I don't think it's a strong an argument as claimed. If you look at what people from Mensa are doing or look at how child prodigies often

With regards to success I don't think it's a strong an argument as claimed. If you look at what people from Mensa are doing or look at how child prodigies often ends with not so successful adulthood it's pretty obvious that it's way more complicated to measure success in life than to look at IQ. Most of the correlation with high income is because their skills are needed by society, but go back 300 years and you wouldn't find the same correlation going even further back it would matter even less. Furthermore high IQ doesn't mean more likely to be entrepreneur or creator of new things. So yes IQ is a very strong model but it's relation to success is much weaker.