True in that container royalties is a thing, but stated so sensationally as to make it lying.

You don't get royalties for nothing. All the references I have been able to find, say you have to work some amount based on Union agreements but somewhere between 700 and 1500 hours per year, and you have to have worked at the port for at least 6 years. They seem to mostly be paid out as an end of year bonus. I haven't found anything that ballparks the amount so I have no clue how much money we are talking about.