Well, the official video says it was a five to six second delay, but that seems improbable, too, because the video was apparently transmitted to a Deep Station module, not earth.
See, there were no small video cassettes at that time. There were no “camcorders” where the cassette fit in.. you had to have your own reel to reel video recorder of 1 inch tape or a huge recorder for 3/4” tape and these needed to be battery powered.
With analog video recording, you would need a HUGE battery, and I do not see the huge transmitting device that would also feed off this battery on the moon.
Couldn’t a camera for that time just transmit instead of store on reel-to-reel? Anyway, I was a kid then, and we had a camcorder that could record to tape. We have a lot of old home movies from the time. It was small, and didn’t require a lot of power.