Even if we could positively confirm that the person is smarter than literally every human who has ever lived... that would be about IQ 200, still far from IQ 210. (The required number of humans grows exponentially.)
Yeah, this is a mistake everyone makes, and it is difficult to explain to people who didn't study statistics.
The short version is that intelligence is an ordinal value, not a cardinal value. You can say that person A is more intelligent than person B, but not that person A is exactly 3.14515x more intelligent than person B.
Intelligence is simply measured in percentiles, that's all. You can't be more intelligent than 100% of the population. The 100% of the population is the population of Earth. You cannot get a higher IQ score than that.
