Sorry for such a late response my friend. Sadly i am not logging into Unreal Forums regularly due to my busy work schedule in past couple of months.
Thanks for sharing this. I have seen this and if you see the limitations pat of the video, you would see that this is more suitable for renders and not suitable for games.
I have heavily researched niagra/vertex animation crowds but this option is fairly limited. My games AI is pretty intelligent and i am working with fewer enemies onscreen at one time but they are very dangerous.
There are some parts in the game where i have hordes, but for those hordes, i have made a simple AI actor (not pawn) which has no character movement component as this component is very performance intensive.
I am working on the first dev-log for the game and would love to share with you once that is out. I will update the post here and tag you if you would like.
Tell me what you are upto and thanks for sharing!