Yes, it does refer to something in BP1. However, you could use the alternative rules in BP2 for Commander traits. They give an added flavour to the game, though they are not quite the same as those in version 1.
The traits were a number of options that could be given to a commander. I can’t remember them exactly, but they were basically, Aggression, Decisiveness and Independence. These each had three possibilities, which could be diced for. Obviously, they were indications of the level of each that formed a commander’s character and full explanations of each were given. BP2 has simplified them. Go to the chapter on Commanders and read up how they work and apply those instead. As I said, they don’t have as much detail but they work just as well and it can give your Army General something to do if you are using the new suggested command rules.
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