Sounds like marketing talk!
If you use the shutdown on the Desktop (or sudo poweroff command) there should be no problem.
Your previous problem is likely a hardware failure or power supply issue - nothing to do with how it was shutdown.
It is simple to connect a pushbutton to the GPIO pins to perform a clean poweroff. See https://raspberrypi.stackexchange.com/a/42945/8697
NOTE All SD Card manufacturers claim that SD Cards are not designed to run an OS.