Sure, but that would be invalidating someone telling you no developers were born in New England.
SV is a 2m+ area filled with local schools, where many of the parents are developers and highly supportive of the education to be a developer. For someone to say “no developers are born in SV” is bewildering.
You've chosen to interpret a missing qualifier as "all" when the more likely response if you'd asked for a clarification would be "most". It was very clear what the point made was, and it was not that nobody born in SV ever becomes developers.
Maybe as a rough generality. 1/3 of the developers I know were born in SV.