Is it okay to break a covenant of protection against a harbi?

Breaking promises is obviously haraam in general, but the Harbi is the one who is at war against the Muslims, and > Allah's Messenger (ﷺ) said: “War is deceit" **[ [Sunnah ref: Sahih Bukhari 3029](https://sunnah.com/bukhari:3029) ]** So does this mean its okay to be deceitful in promises with those at war with muslims? For example, promising a Harbi protection but then just ending him anyway.