I don't get it. If China's military is as weak and as far behind as the author claims, why is he worrying about China's military threats? It should be a cakewalk to head off any threats from them with our much more advanced capabilities. Why is he advocating to increase the military spending for US and its allies? Aren't our current capabilities so much better and so much ahead of them that they will have no hope of catching up?
It's worrying because they're unpredictable and won't necessarily do the appropriate counter move.
For instance, I'm a horrible chess player, and I even tell my opponents that, but yet, they often take a much longer time to play because my moves are so unpredictable it really throws them off their own game (also---I'm regarded as a smart fellow, and I wouldn't make obviously stupid moves, so when I do, my opponent wastes time trying to figure out what they're missing).