Hello Chris.
From the video you have provided it is clear that you saw him shoot you and proceeded to KOS him for it, which is valid. In this situation you shouldn't have been given any punishments. I have messaged GrootBroot and told him this punishment is false and he should be more careful when handling out punishments in future. I also reminded him that it's recommended for staff to avoid handling their own reports so situations like these do not occur.
I will make sure your punishment is removed.
Thank you for making this report and I hope you have fun playing on the server!