Is this just an oversight and they forgot to remove names or a mistake that they have been added early. Seems odd since Majesty and Empress have been removed.
They are valid with the standard BOGO 60%.
Not valid with The extra savings offer or OBC that often accompanies the base promo.
The system should give you the higher of the 2 but lately I've seen it give the extra savings even though the balcony discount is higher. In that case you need to call to have it corrected as you should get the higher of the 2 but not both.
If you are talking about Izumi sushi then yes that should not be an issue.
For the Hibachi yes it can be done but please note that your food may be cooked separately in the back kitchen as opposed to the grill in front of you.
Royals insurance does not cover flights, even if purchased through A2S. They would be eligible to file a claim under trip delay to pay extra costs to get them to the next port (payment limits apply). They would be covered under the CFAR