[tgsovlerkhgsel]

The clause likely isn't "you can't talk about harassment" but "you can't talk about anything that happens at work". That then gets changed into "you can't talk about anything that happens at work, except your working conditions which you have a legal right to discuss", which means any time you talk you risk that your employer will disagree whether it falls under that and ruin you with a lawsuit, so you don't talk...