I believe there are a fair number of blacks with student loans. Maybe even disproportionately more.
Blacks tend to owe more in student loans than whites do.
For one, every school in America will admit any black who can mostly spell their name right. As such, blacks gravitate to more expensive, prestigious schools (where they often drop out).
Second, blacks often have to take out private loans, which are not covered under this loan "forgiveness" plan due to criminal convictions, which make them ineligible for government Pell grants.
Under Biden's plan, whites are likely to see most if not all of their debt wiped out while blacks will see only small percentages of theirs wiped out, while continuing to owe much more.