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First, that depends on what you mean by "this stuff"; Bird does not study intelligence nor behavioral genetics for a living, he's a plant geneticist. Skewed though the survey may be, it's probably more representative than a single non-expert.
Second, why do you suppose the non-response rate is so high and so skewed? And might it have something in common with your own refusal to continue our conversation on merits of your list?
I suspect that professionals who prefer not to respond, rather than respond in the negative about genetic contributions to the IQ gap, are driven by contradictory impulses: they believe that the evidence doesn't allow for a confident "100% environmental" response and, being scientists, have problem with outright lying, but they also don't want to give the impression of supporting socially unapproved beliefs or "validating" the very inquiry into this topic. So they'd rather wash their hands of the whole issue, and allow their less squeamish colleagues to give the impression of moderate consensus in favor of genetic contribution.