Yep. It’s to distinguish it from other forms of homelessness, such as “sofa surfing” (where someone moves from one friend or family member to another for short periods without having a fixed address of their own), people temporarily living in homeless shelters/boarding houses, people living in places which aren’t really accommodation (such as their place of work), and “statutory homelessness” (a broader legal definition which includes a few things which might not seem like homelessness, such as people who are at serious risk of violence in their homes).