Apparently there is a way to do this with treants, eidolons and other units by deleting a line in npc_units.txt file. Tundra have not commented on the issue yet.
There is also a Reddit thread, however I would like to revive this forum somewhat.
What do people think? For me personally this is 100% scripting and IF found guilty there should be some repercussions for both player and team.