Same with me, all trainer hot keys for modifying soldier stats are not functioning. I double checked the instructions, all were working fine until Alien Hunters DLC was loaded. Unlike the previous poster, I really only use the soldier hacks, bumping up their hit points, armor, dodge, aim and etc., and I can't find out how to do that simply with the console commands. There seems to be a LOT of typing involved with very limited use. You can't bump up hack to 150 or Will to 145 or whatever.
[Edited by SirCharlesEddie, 5/14/2016 7:17:53 PM]
When I was using the trainer, it won't add stats from the soldier list in the armory, but I did have it work on troops I brought on missions.