That logic is not sound. If there's some selection criteria to select engineers from the general populace S, and a subset engineers who make it past S are average, that doesn't mea the end distribution of IQs (you're the one who brought up IQs) of FAANG engineers vs the distribution of IQs of the general SWE population would match in statistics. That is, large statistics don't just match because some subset of the populations match at some level. It's a clear misunderstanding of statistics and sloppy logic.
It's pretty absurd that you continue to think you're somehow making a logical argument and somehow think your IQ is above 120.
It's pretty absurd that you continue to think you're somehow making a logical argument and somehow think your IQ is above 120.