From what I understand, if you earn money from a company that gets paid to transport goods, then you work in transportation. If you are a contractor transporting Wonder Bread from where it is to where it's sold, you are working in transportation because you are not their employee, and they are paying you your fee. Here's one way to look at it as well. If Wonder Bread employees were in a union, that contract trucker would not be because he's not a Wonder Bread employee. As a contractor, Wonder Bread may issue a 1099-NEC because they aren't taking taxes of any kind out. In fact, they aren't even responsible for paying the employer portion of SS. They also don't share in the Wonder Bread employee benefits.
Let me also add that I have no idea the background that led to this case.