But they definitely aren't. And realistically, Google hire most of their people in the US, so it would be 300mn rather than 7.9bn.

Like come on, I have met enough Googlers over the years to recognise that they are not all geniuses. They're all very competent at what they do, but that's not the same thing at all.

It feels like my point is being proved to me....

TBH, IQ is not massively useful as long as you are above the median (so 100+). The difference between 100-120 and 120+ in life outcomes tend not to be significant.

Regardless, it's never a good idea to assume you can't do something until you've exhaustively proved it.