Cool video but it sure would be nice to have the dates when the rockets launched (if they did) and if they have not yet launched. For example Sea Dragon was a 1962 study design; never built. If they are going to have that one they should do the Orion Design (the first one with the nukes).
I think it is highly unfair to compare concepts to actual built rockets, might as well just include the Enterprise from Star Trek as well at that point.
Well, the Enterprise from Star Trek is fiction, so legitimate answers would include "zero actual size" and "as big as they say it is".
A true fan would probably reply: "Which one?"
An enlightened person might point out that Star Trek fans are very online, all this info and much much more than you wanted to know is just a google away.
640m / 2000 feet, or thereabouts, is also an acceptable answer.
But the unbuilt rockets in that animation were somewhat legitimate designs, a few steps from actual working prototypes; therefor those sizes had to be somewhat buildable; whereas the Starship Enterprise is FTL fiction, with warp drives powered by antimatter handwavium.
https://www.youtube.com/watch?v=1DHNp7aEviE