"Very strong" is not a very useful description. Quantitative explanations are important. Unfortunately, your linked paper is not available. This one is:
https://www.academia.edu/download/3521147/Pratt___Cullen_200...
Poverty is listed, but it is not a stronger effect than religiosity, family disruption, or firearms ownership. The strongest effects found in this meta-analysis were from "strength of non-economic institutions" and "unemployment (length considered)".
It is always a little frustrating to hear from a certain kind of politically motivated poster who is very interested in in-depth critiques of any theory of crime except their own conviction that poverty is the sine qua non of theft and violence. The evidence does not support this view.