First off, Q says there is no true "deepfake". What is being called deepfake can be detected by the same technology that created it. So, that being said: If President Trump put out a deepfake video of himself, I think the reason he did so might be to put us on notice to look carefully if the Cabal's MEDIA tries to use deepfake footage in the next couple of weeks.

No one in future will be able to claim in court (tribunal) "that was a deepfake video of me (doing whatever horrific thing) doing that", because it can ALL be detected and some of it is on tape, not digital. I'm not so concerned with that right now, but just deciphering POTUS' clear message. It was a VERY strange thing for him to do if it is a "deepfake", so we need to figure out why the team did this.