So is it then an actual % increase in whatever the tactics does? e.g. healing %/healing duration, sabotage duration and so on? If that is the case they urgently need to change the description as it is very misleading (currently it should only affect Barrage and Demolition as stated above). I wouldn't be surprised if that is the case, as there are many ambiguous descriptions elsewhere in the game.
Perhaps someone could test this once wars come back.