If this were book (your "plot", the solution to the Fermi Paradox, would actually be the reveal).
Cut enough fat so that it fits on the inside of the book cover. If you don't want to bore me with SciFi, don't put in the actual book.
Your plot synopsis should name drop just the few things that are most important. Here that's, type III civilizations and quantum computing. I know a little bit about those; enough to make that plot sound interesting to me. If I was really thinking about picking this book up, that's what I might read up on first. But no one needs to if you tell them if they already know this:
To protect its monopoly on the universe, all life is constantly wiped out by a mysterious race that was the first to achieve a type III civilization. And when they detect that the budding human race has invented quantum computers, in an ironic turn of events, H.A.L may be the only thing that can save humanity - from them and ourselves.
That opens the book up to just about everyone. But by all means bore us with a few pages of technobabble (assuming you know what you're talking about). Hard core SciFi fans love that stuff. Those who are not indoctrinated will simply glaze their eyes over it, thinking to themselves, 'computer stuff... okay'.