Really? I hope that is not true. If it is, FS needs to change the tooltip immediately. But actually, I would prefer that it just be changed to 50% like it is supposed to be. 20% isn’t really worth it for only 3 seconds. Especially when there is a better alternative such as swift slaying. I would not mind it being 20% as much if the duration could be longer.
Most of the weapon traits are not good enough to be useful because who would choose them (in the meta) over swift slaying and maybe off balance (unless it is only 20%…).