Why does she go on to say that some might call her a "Luddite"? This would imply that she doesn't believe in technology, which could logically be extended to perhaps include "understand" technology.
The implication in that sentence is that people may assume she is a luddite, but they would be wrong in doing so.
Would they be wrong? I'm not certain about that. From the single clip I would believe that maybe she is.
I don't know if we can necessarily draw that conclusion from the limited information in that statement. It would seem almost as if she shuns technology deliberately.
Because she's throwing around the term casually, like people do? "I'm really OCD about this" ≠ actual self-diagnosis of OCD
I'd feel pretty comfortable saying that no cabinet-level official really "understands" technology enough to make decisions on cybersecurity. They rely on subordinates who (hopefully) do.