[1] https://www.chicagofed.org/digital_assets/publications/econo...
The only place in that paper where you find those two letters next to each other is in the word "technique(s)".
Given what we know about the importance of IQ (and its distribution), I'd say it's a pretty bad paper. And citing it makes for a pretty bad argument.
So control for IQ. Lets say we did. Sadly the statistics already say that a poor white person is more likely to "climb up from poverty" than a poor black person.
See the problem with your argument is that you somehow think that IQ is a factor here.
Lets say there are 10 job openings, and 3 of those jobs are run by people who are secretly prejudiced against black people and will come up with some excuse to not hire them.
That means for a white person there are 10 job openings and for a black person there are only 7, regardless of IQ.
So a white person and a black person with equal IQ do not have an equal situation in a country where the supremacy is white (even outside of racism and the like, there is always cultural bias which applies here).
In my specific case this may not have been true - race-based scholarships were not available to me because of the white color of my skin for example.
Rather than view everything through the lens of race, I'd be curious to see your numbers run with the split based on students of poor urban-schools vs students of better suburban schools.
While I don't have the numbers at hand, I think it's unreasonable to expect that white children of parents in the bottom 10 percent of income are attending good suburban schools in significant numbers, because if you're in the bottom ten percent of income you probably can't afford to live in those regions, regardless of race.
I'm not saying that race is the most important factor, and I'd also like to see splits by schools and other factors. But I think parental income is extremely important, and even after controlling for that we see a very substantial racial component. If race-based scholarships were had such an overriding effect, we wouldn't be able to reproduce these statistics. If you have numbers that show that controlling for some other factor (like school quality) leaves no remaining racial component, definitely let me know, but given how large the disparity remains after controlling for parental income, I sincerely doubt it's the case.
If you're a white guy and you climb up for poverty, be proud of what you accomplished. Please just don't look back at everyone who hasn't made it and think that they all could have done the same.