one study found that adopting a poor kid could jump their IQ test scores by 12-18 points.  

I expected this to link to the study, but it doesn't?

The survey of experts finds that far more experts believe both genetic factors and environmental factors play a role than just environmental factors.

Are you referring to Rindermann et al. 2016? The core table is this,

It is concerning to see 'discredited' used so easily  when it is far from clear that it is an accurate label. This is not my specialty so I'm not qualified to have an opinion, but it seems more like rejecting some hypotheses a priori, without consideration. I'd like to see further discussion which qualifies such claims. 

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