it may not be a stupid question, but it does seem like a disingenuous question (though you probably don’t mean to do that on purpose, others would).
Just because deepfake technology exists doesn’t mean that that all video and audio recordings are immediately untrustworthy. It does, however, mean that anyone trying to defend reprehensible behaviour will have an easy method of defense.
This technology WILL be used during the current U.S. election cycle, and the upcoming Canadian election cycle, and probably every other election cycle after that. Just remember that Roger Stone said “flood the zone with shit”. Know your shit from your shinola.