[Kalium]

You're absolutely, completely, 100% correct in your statements. The 2015 San Francisco Homeless Count Report makes precisely that distinction! They do so because it matters.

Should you choose to check it, you will find that the 48hills page you linked to does not make any such distinction. In fact, it omits the 49% figure altogether and states "That means seven out of ten homeless people used to be your neighbors – before the tech boom and the eviction epidemic".

I think some reasonable people might choose to describe this phrasing as perhaps potentially slightly misleading.