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The paper cited is handwavy and conversational because it isn't making original claims. It's providing a survey for non-specialists. The table I mentioned is a summary of six other papers.
Some of the studies assume workers in poorer countries are permanently 1/3rd or 1/5th as productive as native workers, so the estimate is based on something more like a person transferred from a $5,000 GDP/capita economy to a $50,000 GDP/capita economy is able to produce $10-15K in value.
Are they advocating for abolition of the minimum wage? Can one survive on 1/5th the average salery? Will the combination of inequality and race cause civil unrest?