I'm not sure that LAHSAs homeless count is a good source of data. https://www.latimes.com/california/story/2022-09-24/doubts-r...
In any case, the claim was made that the LAHSA data showed something which I found no evidence of, and in fact found that it showed something quite different. Lots of other data also suggest that a large majority of homeless do not come from other places.
If someone wants to share other data about this issue I’m happy to read it.
That being said, LAHSA's numbers combines both the chronic homeless and the temporary homeless. The chronic homeless in LA are mostly not local (and this is what the LAT found when they did their own investigation); the temporary homeless are almost all local (and are mostly due to financial issues or domestic violence), which is what leads to the disparity in numbers.