It needs a base video to be modified. They need a video of a person talking to do the deepfake.
So this is either an indication of a very elaborate deepfake which managed to surface an amazingly coincidental source video (which should be possible to find on her archives) or that it's not a deepfake but a real recording.
1 - This is an actual video of the guy in his home, but they changed/synthesized the audio and then worked on the lip movements to make it match.
2 - This is a video of an actor impersonating the guy, possibly to the extent of impersonating his voice (although his timbre might make that a little tricky), and then they just deepfake the face on to the actor. An example of this is deeptomcruise on TikTok, something that you should treat yourself to if you haven't seen yet - https://www.tiktok.com/@deeptomcruise (first two today aren't great, here's a good one - https://www.tiktok.com/@deeptomcruise/video/7018171271095553... ? )
I'm not even convinced there's any alteration here, but even if there was both of the above could be possible. Adobe demoed something called VoCo in 2016 that never saw the light of day, not sure if there is something approximating this available today: https://www.youtube.com/watch?v=I3l4XLZ59iw&t=260s
