As a black Airbnb user I am really confused by this article.
Your host was a black person, but you insist that the company itself supports (structurally?) racist practices.
Yet, by hosting you and others, presumably, the host is able to empower herself economically.
Finally, given that the host determines who will be able to book, it might be possible for the black host to racially profile potential guests, such as whites, Asians, other blacks, etc. So the host also has an advantage of another kind of power, the power to discriminate.
I think that this “racism” thing is really complicated. I wish you had enjoyed your stay in the city without the guilt.