I have noticed this as well and also hardly any Muslims and/or Indians, although I did see a very tall black man with his white wife on the train yesterday. They also had two lovely little boys in a pram and I don't know why, but my first thought was that they were American. I was right because I overheard them chatting.
Anyway, the black man in this clip is being referred to as a pelotudo by most X commentators.