The icon in the menu stays because negotiation helper will still work for guild expedition, outposts, daily quests or the mars/asteroid map.
At the moment we dont k ow if using the helper triggers the ban or only powertools. This could be trying powertools out once 3 months ago.
So far Inno did not tell us that we did anything wrong, so I expect it to be either a bug in their detection system or powertools some while ago.