The most challenging maps for you.

Was the video about saves recorded by someone else? Hmm...

The person simply showed what everyone could see in the saves. You could load any save and view any step or battle. The video is just for clarity.

WHERE did he get 1 Archangel and 2 Supreme Angels? It's obvious (very visible)... please give an answer, grandmasters.

I even downloaded the video out of curiosity. And what do we see? Two absolutely identical ordinary Archangels. I have no idea where you saw a Supreme Angel.