Are you really sure flying faster than light is impossible? It's impossible in normal space, certainly. But has there been any determination that compressing space in front of, and then expanding it behind, the spacecraft can't be done? Has there been any determination that it is impossible to compress/expand faster than causality? No. There has been no such determination. NASA thinks it might be possible, but they are waiting on a "Chicago Pile" moment. In other words, they are waiting to see if it's actually possible.
No. The original Alcubierre Metric took all the energy in the universe. Harold "Sonny" White, a scientist at JPL has performed refinements to the math and now the required amount of energy, while high, is definitely doable. Do we have generators that can be mounted on a ship that could produce that much power? Probably not; at this time. You think we are going to stay at this level of technology for another 1100 years? We'll probably be able to do it in ten years, maybe 20. that's 2030 to 2040. We might actually have such now. The government is not going to tell us all we have. There are things in government labs that would have you talking to yourself if you knew about them.
So yeah, considering the time this is set in, it is a simulation. I know, I know, "There are no speed limits in space." No there's not. But there's nothing that says a ship manufacturer can't hard code in a set maximum speed that will trigger the computer to limit the craft to that even turning on flight assist temporarily, if need be to accomplish it. And that's why there are speed limits. One of the rare instances where all 3 powers got together and agreed on something.