They really need to do something about hukou first. I can't read the article yet because I'm behind the wall without a working VPN, perhaps they mention that.
(While I agree with your point, alarm bells go off when I read lists of 'events' with no references)
Milk 2008: (https://en.wikipedia.org/wiki/2008_Chinese_milk_scandal) (http://news.bbc.co.uk/1/hi/world/asia-pacific/7614083.stm)
Milk 2010: (http://online.wsj.com/article/SB126255525849313997.html)
Milk 2013: (http://www.bbc.co.uk/news/business-22088977)
Glow in dark pork: (http://www.telegraph.co.uk/news/worldnews/asia/china/8544851...)
Waste oil from gutters outside restaurants repackaged and sold for consumption: (http://www.telegraph.co.uk/news/worldnews/asia/china/7971983...)
In addition, it's seems non of them relate to China's intentional avoidance of modern technology in farming...
Pork is always problematic since those babies are basically general waste recycling machines, it's hard to figure out what the nongmin are feeding them. Not sure of anything specific though, eventually all these scares start blurring together and I just stop caring too much.
Because agriculture is such a thankless job here, and gov regulation is weak, there is a lot of incentive for nongmin to cheat without much disincentive. And to be honest, the "industrialization farmed" or GMO food that many westerners are worried about....well, those are first world problems that we'd love to worry about instead.
While their manufacturing / industrial productivity and know-how has skyrocketed over 30 years, their farming productivity has kept pace. That's deliberate to give hundreds of millions of people something to do (as another comment noted). Their manufacturing sector could not absorb another 250 million people overnight (or over the prior 20 years).
South Korean farms are up to ten times more productive. If China's farming was as productive as South Korea, they'd only need 30 to 50 million farmers. Currently China has 37% of its employment base working in agriculture, or upwards of 300 million people. The US by comparison has a substantial surplus of food with just 4 to 5 million total people working in agriculture (including illegal immigrants).
This is a good opportunity to invest into farm equipment companies that will benefit from the coming boom in farming productivity in China. As they shift labor into their urban industrial base, they'll begin to change laws to boost farming productivity finally (most likely you'll see a big rise in large corporate farms in China).