yes no ban yet except for people who completed hard tower and dungeons12 with unlogical teams.
Don't forget that your profile will permanently show the first team you used to beat dungeon12, you have to think about this before using the mod for this kind of content.
I would advise you to abuse the mod to 6stars units that are legit to use to beat a dungeon12 team (check the strategy icon to get some ideas), and do it also with the right spells or it'll be obvious you cheated.
Once you have completed that, if the mod works again in dungeon you can be safer as only the logs can screw you. If your profile is highly suspicious, you will get reported by players and get banned.
Make a ton of 6stars first before considering dungeons, so you have a higher account level, it'll make you look less suspicious.