Surely it’s basically exactly the same now still? Take the radio faceplate so it can’t be nicked, lock the wheel, make sure the windows are rolled up and if you live somewhere hot, use a reflector to help keep the heat away.

I haven’t seen a car with an aftermarket stereo in a decade but I’m probably speaking from a place of privilege. I do think they’re far less prevelant now though

They're less prevalent because it's more expensive to do really well now, at least with modern cars. You'll really only see it in dedicated communities. I can't say if they rely on faceplate removal as a security measure though. Security measures have gotten much better since then.