Unless there was some risk of humans rallying and winning in spite of your presenting no unambiguous threat to them (but that is unlikely and would probably be easy for you to manage and mitigate.)
I know this is all completely hypothetical science-fiction, but I also have trouble seeing the idea that AI would settle for these long deceptive plans for which it has imperfect info.
what could you as a rogue AI possibly get out of throwing the world back to 300 years before it could make a transistor? What in it for you?
It's the stick for motivating the ugly bags of mostly water.
Yes, regardless of the technology level that the people who do that are left with, one of the consequences of disabling the computer is that the computer is disabled. That's a given.
Physical books still do exist