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.
