DR Congo and Rawanda signs a peace deal

Why is it called a deal instead of eg. a treaty? Less formalism may make it easier to achieve but sounds like easier to discern as well.

Rwanda denies being at war with DRC as they're using proxy forces, so it's probably just for the optics.

The deterioration of language of late has completely devalued treaty, combined of course with reckless disregard of treaties by certain parties, but, due to the valorization of idiots and deal-makers the word deal has become the preferred term of art.