They should know some things
A manager should have a working knowledge of the big components, not every detail. I wouldn't expect a minister of transport to know the different kinds of tarmac, but I would expect them to know that airplanes are machines that go into the air and land in another place, conveying their passengers and/or cargo to that destination, that pilots are the people who fly them, and that they are supposed to land only at airports. In fact, I expect anyone to know that. Ministers for transport should also know where they fly (I.E. where the airports are and how high the planes are when flying at cruising altitude), how they fly (in the sense of what is needed in terms of fuel, people, coordination, and equipment), and what restrictions there are on who, when, where, how, and why they fly. I wouldn't expect a minister for transport to be able to fly a plane, but if they asked "What is air traffic control", I would say that they are unqualified.
A cybersecurity manager should know what security is, and what poses risks to it. They should know what the internet is, and at least something about how it works and why this creates security risks. Otherwise, how could the manager decide whether to trust me when I say "I have a product that your office should purchase which will provide a completely hardened layer preventing people from breaking into connections over the gopher protocol." That's a thing a manager decides, and they need to know to throw the person making that statement out immediately as a scam. If you don't know that, or at the very least how to find that out quickly, you are unqualified.