You can't scapegoat everything on the KMT, especially when there's no ties.
But there is some truth that you can unify the society by focusing on internal problems, finding an "other" to beat as a scapegoat. Though there isn't anywhere a significant enough issue with disunity that it would be needed to employ tricks.
In my view, China should wait until the US invades first, because China's up arming pace is faster than the US. While the so called "one China policy" humiliates our country much like the Minsk agreements, in the same way, they pragmatically also serve to buy us time to rearm, for the inevitable day where we'll return to the territories US want to annex.
Remember the goal for China is not just to defend it's territorial integrity, but to draw in the American aggressor, bleed him dry, destroy all the cities of his collaborators, and bury the spirit of American revanchism.