Is screen mirroring only possible on enabled devices?

I've owned an LG GX2, LG V20, and an LG G5m out of which the GX2 had a micro USB port to charge and a micro HDMI for video output, and the V20 and G5 had video output through USB type C to HDMI. I've recently got an LG G7 or whatever it's called, and it no longer works. I've read several articles that suggest that with the right combination of cord/adapter that any Android could be mirrored through HDMI to TV. I'm pretty sure I already know the answer just want to be sure. Sources: How to Connect Android to TV How to connect your Android phone or tablet to your HDTV