Nah.Im willing to bet the yellow denotes him as being a person of importance. So when the employees see the amount of yellow they understand the significance of the person. Look at the other behind that just have a yellow hat and/or collar.
just my thoughts
Chris
If you look at other photos posted on the Bloomberg article, there are a number of people in the group who are also wearing the yellow coat. It's probably just means that he's a visitor. Yellow is a high visibility color and anyone wearing that jacket probably needs to be accompanied by someone in a white coat.
It's probably part of Foxconn's security policy. Someone wearing a yellow jacket should not be wandering around unsupervised.