Of course you’re correct. I overthought his question and extrapolated into the purely aero direction.
One of the best comparisons BRR does is test the same model tires in different widths. The few tests performed have shown that there is no clear outcome for tires that should be more similar to themselves (in larger/smaller width) than other tires in the same width. Which is interesting looking at the overall gravel category where in many cases, the narrower versions of the tires have lower rr than the wider version(s) - from what I can see often due to the thickness of the casing remaining the same as the tire gets larger.
Which seems to indicate one’s mental model should be that rr may be higher or lower as the tire gets larger, but aero losses will always be higher for the larger tire.