I work for an advertising company.
The amount of AI used in ads is pretty significant, from the items in the video, to the music and voice. Pick a place, drop in some people, change bits and pieces at will and then add gen music and voice over in whatever languages you need.
I doubt most people even know this is happening in most commercials. Though some are pretty obvious (people merged with animals etc.).
Music and voice cadence picked based on heavy research. People talking, synced up to what they are saying. It's amazing stuff.