Note that you're assuming that a nanosecond is a tiny amount of time. It's tiny relative to what we're used to, but as far as what "implements the universe" goes, a nanosecond could be enough time for a huge amount of occurrences to happen within. We don't know.
If the universe gets cloned one time every second that would still be a huge claim.
A million times every nanosecond is even a bigger claim.
Now imagine how many states the universe can be in, and how many times a second can be meaningfully divided.
If you can solve the "one clone every second" then I would be satisfied.