Thankfully this is true - it's bad enough now with all the smartphone use whilst driving.In Australia screens that play video and are visible from the driving position are illegal. I suspect that may be true elsewhere and that it might be the reason for Mazda doesn't do it.
I confirm this does work. Just don't let Mazda upgrade the entertainment system beyond 70.Only way I know is to install AIO Tweak "Videoplayer" of www.mazdatweaks.com. Installation in the car/to the MZD is possible via USB at firmwares 55 up to 59.00.544. From 59.00.502 - 70.00.100 you have to do the serial access www.mazdatweaks.com/serial first to be able to install tweaks via usb again, as Mazda deactivated this from 59.00.502 onwards.