AirBnB racism claim: African-Americans 'less likely to get rooms'

> The study suggested that black hosts were just as likely to discriminate against black people as white hosts were

I wonder if the discrimination is not so much against blacks as against less wealthy people? Blacks are disproportionately represented among the less wealthy in the US so using black sounding names as a filter will also be a weak filter against less wealthy people.

I'd be curious if the discrimination rate depends on the type of host. In particular, I'd like to see a comparison of hosts who are renting out a room in their own residence and hosts who have separate houses or apartments dedicated to AirBnB.