Wow sorry to hear that. If you can, check if the device is still available over ADB. If it is, try re-running the script.
Not sure what happened in your case, I flashed many ROMs and ran the script against them to see if anything bad would happen. No issues.
In any case it won't be a Hard Brick. Power off, hold [volume-up] insert power jack and tap the [power] button 10 times. (I think. I lost my remote ages ago and can't check.)
No big loss though, it hasn't been used in years.