Are there any successful data scientists with low IQ's?

The answer is likely yes. Income to IQ comparisons show that IQ is directly correlated to income. However the sample points show plenty of extremes on both sides, even very stupid people with an IQ of around 80 can be among the top earners.

So in terms of income yes. But why should anyone want to be a scientist without the capacity to understand the topic properly. Also usually low IQ people are all but interested in science.