To be fair, people who don't know all of macro there is (which honestly is a lot) limit themselves by having this knowledge-boundary in their head of things they "do" know and things they "can" know but completely ignore the things they "don't" know since it's just a big black unknown hole meaning ultimately their subjective assessment to which degree they know and understand macro is always flawed.
Looking at it from the opposite side, someone who would be aware of all macro things they don't know/understand would
a) never ever say they have good macro, quite the opposite even
b) actually have good macro to begin with (therefore higher rank on average)
I'm pretty sure there is a term for this in science but I can't really put my finger on it. Basically something similar to Dunning Kruger but more focused on the aspect of limitation and bias.
Edit: Found something on the topic https://www.coursera.org/learn/intellectual-humility-science/lecture/xOacy/the-illusion-of-explanatory-depth