They really are just Rhythm & Movement: Extra Crap Edition.
It's almost sarcastic. It's like they haven't come to terms with Brexit and so they say "Fine, you lot don't want rainbows and everyone loving each other, let's give you what you actually want then", hence mostly white, not-so-photogenic people in grey rather dull environments showing dank, grey old England.
Why are you so upset that the idents mainly feature white people? The UK population is mainly white people and the Exercise ident has black and asian, elderly, men and women in it.
I am the Optimistic Goldfish.