During this time period I believe all of the clips used for things like reveals, champions spotlights, etc., were taken directly from playtest footage of a few specific games that would have their replays saved after the champion's spotlight VO was recorded. So it's possible that this was used just as "this is the best clip that showcases all of Urgot's spells" or possibly just that the producer thought this clip was too funny not to use.

If you look at champion spotlights from this time period you can see other questionable gameplay since all of it is just raw playtest clips. For example, in the Evelynn spotlight there's a Corki that just flashes the wrong direction (side note: I'm the Shen in this clip).