Only about 17 percent of that 42 percent were white, That's the problem with graphics like that.
This is from an article interviewing someone who helped conduct the survey mentioned
“It is no secret that trans people, trans women, and especially trans women of color face immense barriers in HIV prevention,” said Joseph Osmundson, a clinical assistant professor of biology at New York University and queer health advocate, who did not work on the report. “This new research not only formalizes this knowledge but addresses some of the underlying reasons, including increased rates of homelessness and transactional sex.”