"In 2019, 36% percent of the chronically homeless suffered from a chronic substance abuse problem, a severe mental illness, or both"
The key word here is "chronic." According to the National Alliance to End Homelessnes[0][1] (based on data, including the link you cited, from HUD[2]), less than 20% of homeless people are chronically homeless. As such, less than 10% of the total homeless population "suffer chronic substance abuse problem, a severe mental illness, or both"
So you're projecting the traits of a (relatively) small group onto the larger whole. An assertion which seems problematic at best.
[0] https://endhomelessness.org/homelessness-in-america/homeless...
[1] https://public.tableau.com/static/images/20/2020SOH_PIT_bars...
[2] https://www.hudexchange.info/programs/coc/coc-homeless-popul...