It's not lying IMO, it's prioritization. Because, again, saying more correct stuff doesn't mean you learn better, and it could actually make you learn worse.
Personally I don't think it's that big of a deal or evidence of much. Most stuff has to be focused otherwise we lose the plot, that's just how people are. It's the same reason why when you go to the doctor your doctor is going to not mention 90% of the stuff about your condition. It's not necessarily helpful and might actually be harmful.