There's not much of value in that screed. He's right that we shouldn't ignore China, but for a number of wrong reasons, and he's terribly wrong about how powerful and wealthy China is.
It baffles me that people skip over their ongoing demographic crisis/population pyramid inversion which will have been the largest and most rapid in human history. Only 900 million people and 1/3 of them are over 65 in 2050? We're rapidly approaching the closing stage of the second consecutive Century of Humiliation, and the CCP will not exist at the end of it.
The US and western liberal democracies just need to keep their shit together for another 29 years. (which, I admit, is easier said than done)
1 US citizen is worth about 5 PRC citizens in terms of economic activity. The PRC's GDP per capita is roughly the same as Brazil's (this situation is unlikely to improve either [1]). Imagine Brazil scaled up to 900 million people and 1/3 of them are over 65. Social welfare systems start to buckly/collapse, and retirement benefits must be cut or the retirement age raised.
The only thing the PRC could do right now is force people to reproduce at gunpoint, and they even shot themselves in the foot there with the One Child Policy and now having 30 million more young men than women.
It's going to be scary to see Japan, the PRC, the ROC (Taiwan), etc. lose 1/4 of their populations in the next 30 years. The US is the only developed country with okay demographic projections through 2050, and that's only because of immigration. Not sure where you're from, but if you're in a developing country you'll probably be doing okay in 2050.