I haven't watched much of it (yet), but I'll comment based on the assumption that it's a similar documentary to others I've seen here in Australia (like this one).
We have homeless people in Australia (their visibility has increased very significantly over the past couple of decades), and there is certainly no shortage of poor people. If I were to comment on one point where the US departs from Australia, it's that in Australia you would not expect to see somebody who has a steady job also be homeless. The metropolitan rental market in Australia is very expensive (probably worse than the US), but the minimum wage is sufficient that anyone who has a job can expect to be able rent somewhere.
While COVID19 is awful, one of the most interesting policy developments we've seen since the outbreak is the very sizeable reduction in Melbourne's homeless population. The State Government is paying to put them all up in new public housing or hotel accommodation. There is significant public interest in maintaining that support post-pandemic.