The source provider was included in the original posting. The image is linked from their website.
From your original posts' link:
"Implication #1: In order to truly understand the causes and consequences of massive racial disparities in student debt, we need to be able to track debt and repayment patterns by race."
"Implication #2: Research and policy focusing on undergraduate borrowing alone will address only a fraction of overall racial disparities in student debt."
"Implication #3: New repayment options such as the Revised Pay-As-You-Earn (REPAYE) plan may alleviate the worst consequences of racial debt disparities, while failing to address underlying causes."
So, there you have it. The authors of the study you cited aren't even making the clams you are.