[DiogenesKynikos]

> Just watch some of the tofu dreg videos

The video you posted is from Falun Gong, a cult that is roughly analogous to Scientology. A few pictures of bad concrete do not say much about the quality of construction as a whole in China.

> This is why China will be irrelevant in a few decades, as it recedes into its own shell.

Given that China is the largest trading nation on Earth, China "reced[ing] into its own shell" is highly unlikely. China is highly interconnected with the rest of the world.

> "the pay is decreasing fast" ... "travelling outside the country is discouraged and passports are hard to get"

You're just making this all up. Pay has been increasing steadily in China, and is now higher than in Mexico, for example. Chinese citizens can get passports easily, and travel is not discouraged at all. Outbound tourism took a plunge during the pandemic, but it is recovering and is now approaching pre-pandemic levels (about 150 million outbound Chinese tourists per year).