This isn't really correct. How they decide what an IQ of 160 is, is by get thousands of people together, asking them questions and seeing what percentage of the population get which questions right or wrong.
Questions that are tagged 160 are irrelevant because they norming group is WAYYY to small to say 1 in 30,000 people will get this correct. It's simply not possible to come up with such a question. They questions that get you 160 on IQ score are almost certainly questions that no one in the norming group got correct.
So no, there's zero proof that 1 in 30,000 people have an IQ of 160. There simply haven't been that many IQ test administered to the general population to determine that.
This will be great for Kenya and other countries like it.
A really bad problem in these countries is their best in brightest are too busy doing service jobs for Westerners than doing the work in manufacturing and infrastructure that builds their capital base.