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Short parents can have tall kids and vice-versa. Smart parents can have dumb kids and vice-versa. Genetic inheritance is complicated. Effective IQ can be downwardly influenced by factors such as nutrition. Reality is far too complex to be captured by your pithy sentence, or my pithy paragraph.
I think it's fair to say in some instances that a person would have had a higher IQ but for some thing, but the term "effective IQ" is semantic jibberish. The score simply is whatever the test says it is.
Fair enough, it was a term I just made up to concisely convey the notion you described: “were it not for these factors, the results of the test may have had substantive differences.” Perhaps I failed, but I think my failure was an unfortunate distraction from the main point which you seemed to apprehend anyway. So there’s that.
