My position is like other hereditarians on the issue. The variations in IQ are MOSTLY due to genetics. Mostly. This is a moderate position,Yes it tells us that either Gladwell or some editor is prepared to admit an honest mistake. It says nothing about the Flynn effect or its implications.
Well that's strange because it means most of what you keep declaring to be "proven" and "undeniable", isn't.
Meh, not really. There's a lot of evidence for environmental effects, which that position would need to discount as significant contributors. So it's actually a position at the extreme end of the scale.
and it means there is room for environmental effects, as in the Flynn Effect.
Not really. The problem with the Flynn effect, and other documented environmental effects, is that they're not small. Your position doesn't leave enough room for the Flynn effect - you end up needing to discount a lot of it in some way.
They believe that IQ variations are COMPLETELY environmental; genetic variations have absolutely NOTHING to do with it.
No, they don't. Gould wrote about genetic effects extensively - it's the basis for some of his criticisms of the statistical methods used in the hereditarian approach.
but it is a fringe position in psychology.
Well, yes and no. The most common position in psychology is that IQ is fairly irrelevant to human behaviour - most psychologists, an overwhelming number, study human behaviour without referencing it at all. Of those who have decided to dedicate a portion of their careers to this subject, yes, a fair number of them see it as saying something significant about the groups studied than not, but that's still a minority overall. It's like how there are always more religious people than active religious sceptics - because most people who don't believe in a religion don't end up discussing it at all.
You may think that hereditarians simply believe in the opposite of what they believe.
No that's the mistake you make with those who emphasise environmental factors. As a general principle, you can't both call yourself a moderate, and condemn everyone who disagrees with you as Marxists. You need to chose one or the other.