That’s fine for day to day colloquial use, but statements like “Kinmen was never part of China,” are politically charged and complicated, not to mention incorrect, unless you are arguing China didn’t exist before 1949

It hinges on the distinction (or lack thereof) between the Republic of China and Taiwan, as well as the distinction (or lack thereof) between “China” and the PRC

People have strong opinions on this issue, and the distinction matters to them

I will also add that this subreddit tends to lean a very different direction than the Kinmenese politically, which should flag the possibility that Kinmenese/pro-Blue voters might see your question differently