I know nothing about your specific cases, but many managers are smart enough to understand the statement that there are 30+ hits per page view, especially when it is demonstrated with a simple webpage example with two counters (or even a clean chart). Why did it take 9 months to explain?
A requirement for almost any management role is to be able to explain things clearly to non-specialists. I have seen many engineers writing good code but hitting a wall trying to explain a simple concept to someone who does not share their exact terminology. It is a painful, toe curling sight. Let's keep those engineers writing code, they should not be managing other humans. My 2c.
In my company a lot of big projects are set up for failure from the start because the big guys often listen to slick salesmen (preferably from the outside because they don’t trust their own people) and not to the people who raise concerns that are valid but hard to understand. Some things can’t be dumbed down but they are just complex.
In my view a lot of dysfunction in tech projects comes from the fact the higher ups don’t want to understand what’s going on and also don’t want to listen.