First off, the article's source is a different article from 2016, that cited an undated survey that is self-reported data from a national sample by "TransUnion Rental Screening Solutions". So the numbers are clearly higher now considering how much property value grew in the last five years, and probably weren't even scientific in the first place.
On top of that, go back and look and the initial survey is clearly asking them how much property they rent out, NOT how much they own total (exact word were "Renting Stats: Average Total Value"). Their overall property ownership is going to be much higher if you count personal residence and other property that they own but don't rent.
You go back to the survey, and it said 11% of respondents "manage but don't own". So the respondents weren't even all landlords, they included people who didn't own any of it at all? That would pull down the averages and make the scientific basis even more in doubt.
But let's pretend for a moment the data is correct, even though it's outdated and unscientific....
* it shows that the median landlord is renting out 3 properties worth ~$300,000 combined.
* meanwhile, the median Black family in America owns 0 properties and has just $13,000 in net worth.
* even the median Black household
with a graduate degree only has $70,000 in net worth
So even though it doesn't sound like much to you, the difference between the median landlord and the median Black family is very, very large. And I can't find any statistics for how many Black landlords there are, but overall in America about 10% of families are landlords. Considering that median White wealth is 15x higher than median Black wealth, that would suggest, what, perhaps 3% of Black households are landlords compared to the 60% who are forced to rent?
https://www.washingtonpost.com/business/2020/06/04/economic-divide-black-households/