I don't think so, but it was the weird way Whitaker referred to Sessions. Plural is Attorneys General, so there's that too.
Add: "General" is an adjective, not a rank. But the Trump administration is staffed by idiots, so...
I'm sure Whitaker liked to think of himself as a general. "The term was originally used to refer to any person who holds a general power of attorney to represent a principal in all matters." https://en.wikipedia.org/wiki/Attorney_general