IMO it is quite obvious that you shouldn't be using an alt account for a lot of things other than what it literally states in the rules which you put in bold "Using alt accounts for mining & missions is still allowed."
I simply see this as an error from your side and I do understand the dispute you somewhat have against this ban, we could have been a bit more clearer in hindsight. I'm going to be accepting this appeal and your ban will be lifted, we do appreciate your cooperation with the staff members and have kept a good conduct. Just make sure you read the rules and if you have any questions, don't hesitate to ask us.