There's a difference between "software developers" and "FAANG software developer" though, which is a source of great cognitive dissonance when people see that industry averages are only slightly above $100k/year but FAANG compensation is like 3-4 times that for basic engineering work.
Both are paid a premium, but FAANG is paid a massive premium, and there isn't much precedent for collecting that massive premium continuously for 30 years.
EDIT: Actually in that spreadsheet I would argue that the $250K compensation is too low, the 10% return on investment is too high, and the 30 year timeframe is not sustainable.
Lotta software developers out there at non-FAANG companies getting paid FAANG or near-FAANG wages. Probably more software engineers making 250k+ outside of those five companies than inside them.
Also I kinda question the assertion that these companies being active and important in thirty years would suggest something untoward. In most other industries, the "Blue Chip" companies are pretty durable. JPM's lineage goes back to 1871, and that fact does not prevent its current employees from being well-compensated.
Both are paid a premium, but FAANG is paid a massive premium, and there isn't much precedent for collecting that massive premium continuously for 30 years.
EDIT: Actually in that spreadsheet I would argue that the $250K compensation is too low, the 10% return on investment is too high, and the 30 year timeframe is not sustainable.