You may not like their writing style but they have a point. I worked at a place where China made wearable components for machines. The material was an aluminum bronze alloy, every once in a while they'd slip in a batch of steel painted to look like aluminum bronze, and hope nobody caught it before full payment

And a family member worked at a major heavy equipment manufacturer that had axles made in China. It goes well for a while and then they secretly change material or heat treat process, and you find out 12 months down the road when all your equipment suddenly had a high failure rate in the field.

My Asian friends said its part of the culture there: to do what you think you can get away with.

I can't verify that since I haven't lived there, but even their government tries to scam people from other countries.

Take a looke at the European standarda logo on electronic and lighting equipment and compare to Chinese export logo. They are deliberately designed to trick a person.