Do you have a link for the IQ stat?
It contradicts my experience with Hispanics ( legal and illegal). It takes a highly motivated, well organized, daring, and highly disciplined person to cross the southern border illegally. It is also very expensive. A higher IQ is associated with these character traits.
The only reason they are crossing illegally is because they, or someone in their group, cannot get a tourist or student visa.
The smart, disciplined, financially able, high IQ illegal immigrants buy a $100 bus ticket to LA, and then just overstay their visa.
40% of USA illegal immigrants are overstays.