[General Questions and Answers] Droidriven:
No, if it is permanently hard bricked how would they ever know, they would have to be able to boot the device or connect it to PC to know it was rooted. From what you say, neither of these is possible so they will never know. And by the way, if it is perma-bricked then Samsung can't even fix it.

This is what happens when you flash something on your device that wasn't made for it or if you miss a vital step in the flashing/modding process. Each model of device has a different partition table than other models, when stock firmware or custom ROMs are flashed on a device, there is a file in the firmware or ROM that controls what is in each partition and which partition the various .imgs are flashed to. This means that when you flash something from a different device(by mistake or intentionally) one or more parts gets flashed to the wrong place, this can and usually does brick a device because when you attempt to boot the device, it can't find the right pieces in the right places so the device won't boot.

OK, now that the explanation is out of the way.....

Does your device attempt to charge when plugged in? Does the LED come on when plugged in?

Does PC recognize the device when connected? Does it report any sound when the device is connected to PC?

Does the device vibrate when you try to power it on?

Does the device respond to anything at all?

If your device won't boot to download mode manually, you can try buying a USB jig from eBay for $4-5, it is a very simple to use tool that forces the device into download mode, it just plugs into the USB port on the phone and 3-4 seconds it boots to download mode as long as the device isn't absolutely corrupted.

You can also make your own USB jig by cutting the micro USB male end off of an old USB cable and then connecting a 300k resistor(or any combination of resistors that add up to 300k, it has to be 300k, it cannot be more or less than that) to the correct pins in the USB connector, this is usually done by connecting the ends of the resistor directly to the pinout contacts in the micro USB end, it can also be done by leaving a small amount of extra wire to connect the resistor to the wires instead of having to modify or solder the resistor ends to the pinouts.

There are videos on YouTube for making your own jig, if it works for you you'll be able to flash the stock firmware via Odin. This isn't guaranteed to work depending on what you messed up. If your bootloader is corrupted then this won't work because the device won't know what to load when powered on.

The next step after that is to try JTAG to repair the device but that costs and has to be sent away or taken to a shop to do that. Getting the device replaced is simpler, easier and less expensive than getting it repaired.

These are your only possible options of getting back to a working device, the way to keep a working device once you get it is to absolutely research and read absolutely EVERYTHING you can find about your device including how to repair the device if something goes wrong, figure out how to get back if something goes wrong, make sure your device's stock firmware is available for download, ask questions about the things you don't understand, make sure you understand absolutely every part of whatever method and instructions you attempt to follow BEFORE you do ANYTHING to your device.