The British Museum was literally asked to help restore it, it's not like they're keeping it forever (only until 2023 it sounds like?)
Maybe the article is wrong, or did you just not see the preamble?
Here’s a highly abridged list: https://www.insider.com/british-empire-stole-cultural-artifa...
The owners have asked for them back and been refused. I don’t see that as a historic issue, I see it as a current one.
When directly asked to return items they say no.
https://www.britishmuseum.org/about-us/british-museum-story/...
What’s hard to hate about that?