Minion attacks and spells are not YOUR skills. That's why nothing except ally or minion damage (even global damage modifiers) affects them. Same as for Shimmeron's wording change, traps, mines and totems dealing damage are not YOU dealing damage but they are using your skills, from your gems. Minions are using their own skills that can be modified by linking stuff to the skill gem that summons them or putting the gem into an item modifying socketed gems effects. (like sire of shards)