>Most filming takes place in London where the majority of the british/african descended population live so they get opportunities that elsewhere would be snapped up by Asians.

There's more asians in London than black people. By quite a large gap.

>probably helps that nobody gives a fuck about Asian diversity, while african diversity is appealing to any potential american audience.

And that's what people are calling out. It really isn't "diverse" if they only care about seeing black people and not asians (or other groups).