Regardless of their ancestry timeline, the natives have known to have been living there for at least three centuries. Expelling them now is cruel and unwarranted.
This does not mean I disagree with the expelling being cruel and unwarranted. I do think it shouldn't belong to the UK, just don't think that "natives" is meaningful here or explains the reasons.
The equivalent is expelling everyone from Australia because US/UK wants to build military base there.