I can't see any way that you came to that possible explanation. No, it does not mean that the flight is cancelled because of the riots. It is not cancelled for any reason which you could have easily checked as I just did.

What that message usually means is that the name on your reservation does not match the name on your passport. There could be many explanations for that including a typo when the flights were booked. It doesn't always mean that you will not be able to fly, but it does often mean that you won't be able to fly.