That made no sense at all.
Saw a post under the topic and it said. Playing on this and then change to steam version will get me banned.
AlterIWnet have nothing to do with steam and is made to run without it. If you however run AlterIWnet and steam at the same time there is a slight chance for you to get banned but there is no such cases confirmed.
Just keep AlterIWnet and the steam version in different folders and you should be alright.