In short, China has “lost” 275 million agricultural jobs. Alternatively, some other sectors gained 275 million workers. Is this a good or bad thing? By all accounts, food production is up. People have been freed to do other productive things. People in China are living better, along some metrics, than before. Sure, pollution has increased; but they’re working on that problem too.
Some of us remember when typewriters and secretaries were ubiquitous in every office. They have been replaced with computers, empowering each of us to type our own emails, to gather information, to create reports, and so forth. We’ve become more productive, and now have entire job categories which were previously unimaginable.