I see the picture of what it should look like in joolsplus3's post #6, without even having to play the video.
Actually, it's the opposite. If you look at the pic above you'll see that it's different from your picture. I don't know if it makes a difference as far as safety, but just in case ... facing the rear of the seat, you put the loop of the right strap inside the left and thread them on the splitter plate together. Does that make sense? Just look at the picture in post 6. I used to have an RA55 and it was the same way. It looked complicated to me at first, but turned out to be really easy to do. HTH