It is not a secret Taiwan will destroy their facilities if invaded, making entire endeavour futile. China can posture all they want, it's all empty threats. They have no means of stopping the sabotage, no means of efficiently crossing the sea, would not want to test USA etc. Basically their entire army was improved in past decades, but is still completely untested. It's all another dictator delusional dream about uniting the nations. Pretty sure that current status quo is preferred by everyone.