I presume that the BBC is quoting “reunification” to make clear they don’t necessarily agree with the term’s usage, but use it because Xi did. I would do the sa

I presume that the BBC is quoting “reunification” to make clear they don’t necessarily agree with the term’s usage, but use it because Xi did. I would do the same since I personally find “annexation through imperialist military conquest” to be much more honest description of the situation.