I find it interesting that you are basically saying the same thing, even if the reply you are confused by simply made some assumptions you were not able to make and was a bit less precise.
It’s interesting how people will say things like “This is wrong and confused in every possible way” even though it’s not, making it and them in turn the ones “wrong and confused in every possible way”.
Maybe if we are a bit more generous with others we won’t be compelled to be so pretentious and denigrating by saying things like “This is wrong and confused in every possible way”, about something someone said and believes.
Does the original reply actually make sense in context? I can't see how.
It's a response to someone saying "you can't draw any conclusions of IQ significantly before 1950 from how the line behaves after 1950", and it says "And that’s because IQ is a statistical distribution, not an absolute measurement of intelligence."
This seems like a non sequitur to me. Am I missing something? (Bear in mind that the 'line' under discussion is an increase in unstandardised scores.)