"Dumping ground" implies other places did this to CA, which isn't substantiated by the article. As it says, the vast majority of CA homeless are from within the state. In the cities of CA, as in other rich cities, homelessness and high housing prices come from the same problem: prohibitive regulations on housing construction.
Whenever they do these investigations of how many of the chronic homeless are local or imported problems, they ask questions like “where did you become homeless?” (Crashing on a friends couch doesn’t count) and always avoid the question “when did you move here?” (So someone moving in a year ago to make it big and became homeless 3 months in would count as a local also).
They did a study in Seattle that found that most of the homeless there were previously housed in Seattle, but also that most were housed in … pioneer square. That would be like someone in LA saying they were last housed in skid row.