I don't exactly pay much attention to modern media these days so I'm not the best canary in the coalmine for this and the only time I've seen this movie even mentioned was your post 4 days ago about it.

The casting doesn't surprise me though. Not only is anything "British" now washed in such a way to reflect the population dynamics of London, with or without the stabbings since Arthur stories do feature swords, but in general cast lists are simply check boxes for modern "diversity" where any authenticity is ignored when historically those involved were all pale as fuck.