I don’t think he believes what he says for the reasons hes claiming. I think if he’s really set on not invading it’s because hes seen how poorly its working for Russia. China wants Taiwans economy, you cant get that if Taiwan looks like Ukraine before you even get control.
If Xi is being serious it’s probably because he’s realizing he needs to take Taiwan through economic and diplomatic, and probably clandestine diplomatic means. Weather he has a plan for that remains to be seen.