San Francisco refers to the system as Muni Metro(politan) Light Rail. They count some of their stops as subway stations, but on this official page they don't mischaracterize the whole system as subway.
https://www.sfmta.com/getting-around/muni/muni-metro-light-rail#:~:text=The Muni Metro system consists,surface stations are wheelchair-accessible.
Melbourne calls its under construction commuter rail (Metro Trains Melbourne) tunnel the metro tunnel. In that case I believe it's intentional mischacterization, due to their embarrassment that Sydney has a metro (along with most other large, global, cosmopolitan cities).
Line 5 is going to be a big improvement over the bus, but based on all of the surface section testing videos to date, those who are misled into thinking it will run the way lines 1, 2 and 4 do are going to be disappointed.