The goal is to offer a real Threat to keep the US ears pinned back while they storm onto Taiwan and seize it quickly. Holding back Japan and India with a Nuclear threat. This is step one in a four act play that will be WW III. Remember—they think 19th Century—Not 21st Century liberal speak. They do not care about world opinion. They will buy or force silence. If the USA THINKS of getting involved with “Re-Unification” the Media will go 24-7 with a stream of lies and that any move is racist, White Rule Imperialism, Trumpism etc... In the end China will get her Island back and Russia will get Ukraine (they invade quickly). After this there is the “Re-Unification” of Korea to come. Then the pull out of US ships and planes from Japan and South Korea. China will then move on Vietnam, Malaya and Singapore.
Although much of what you state could happen, we're not going to abandon Japan and South Korea. Too much American blood sacrificed, and too much ground to give away. Taiwan will most likely be lost, amid terrible fighting by multiple nations. One of those nations will most likely be Japan fighting China, and we had better back up the Japanese. If Japan is lost, then so is the U.S.A. Then again, our own Democrats are destroying the U.S.A. from within.