Some fair points and some outdated ones.
China's biggest strength is also it's largest weakness, it's integration with the global economy. Essentially it boils down to boycotting business that manufacture in China while encouraging your local elected officials to press government into reducing trade with that nation.
The problem is, most folk in the west think of China as "just another country" and are utterly ignorant to Chinese mindset and philosophy.
From a military perspective China is catching up quickly. There is no problem that numbers and money wont solve. China has both of these.
It is even more simple than that.
Stop buying Chinese goods.
I find it hilarious to be honest, when I hear people saying things like this, and they think that such actions can only be done at a Government level. Like they have absolutely no control over their own buying habits.
Long before actual Governments got involved in the boycotts of South Africa, individuals and businesses were already doing it. Starting in 1965, you already had businesses starting to disinvest and move their operations out of the nation, and stopping all imports and exports with them. And Universities globally stopped accepting joint research programs with segregated institutions there. And this was long before a single government officially entered a boycott.
I think my biggest problem with "The West" is that so many seem to think this is a problem that only the Government can address. This last year there was some minor rumbles over boycotts over what was happening in Hong Kong, but that was quickly forgotten. If people really want a change, they can start by organizing and making their opinions known. For example, stop buying iPhones, and let Apple know that as long as their products are made there, they will no longer buy them.
But no, they are not "catching up militarily" because just buying equipment is not enough. You also have to have the strategies, tactics, logistics, and doctrine along with them in order to make effective use of that equipment. And that is where China is falling on its ass. They are equating more toys with being "more powerful", not realizing that they only have a small piece of the puzzle.
Why do you think I keep bringing up the exact same things over and over again? UNREP, Fleet Operations, airlift capacity (a crucial factor in logistical support), these are all the very issues that will always keep the Chinese military nothing but a local land based threat.
Let's see if this makes sense. When the US started the Civil War, it was actually still using tactics largely from over a century earlier. Some slight modifications on the old "Volley Fire" tactics that were by then called "Napoleonic" because of some minor updates. Still getting into large formations, marching out in open fields to meet your enemy, then volley fire until one side or the other broke and ran. Yet, the equipment had already changed drastically in the last century. Early paper cartridges, riffled guns and the minie ball. Yet, they were still fighting as their grandfathers had been.
Well, within a few years that was all gone. Open formations and box marching replaced by forming up behind trenches and barricades, obstacles in the path of advance, even early "automatic weapons" and breech loading artillery firing explosive shells. That entire war started with tactics right from 1776, but ended with tactics that would be familiar to those who would fight a generation later during WWI.
Now China, it is doing the exact same thing. It has never felt the need to conduct fleet operations, so has never done so. The same with UNREP, or anything other than a token airlift capacity. It is still largely the same military that they have had when they took over 70 years ago, just with newer toys. And the problem is, you and many others are looking at the toys. I am looking at how they are trying to use those toys. And no, you can not develop things like a "Fleet Doctrine" and UNREP, and try and put them into place during a war. By then, it is too late.
They can literally have the best ships, planes, artillery, tanks, and rifles in the world. But if they are using completely outdated tactics and logistics to keep them in operation, how well would they do against an opponent that has lesser equipment, but a better doctrine? And think carefully, that is literally the entire situation at the start of WWII. Both the US, UK, France, and Soviet Union were using outdated equipment, and the 2 most powerful Axis nations (Germany and Japan) had the best in the world. But both had much more simplistic doctrines and tactics, and within a few years were both completely overwhelmed.