Results:
Adding the
Disney Dining Plan to a DVC stay
did earn the 200 Disney Reward Dollars Bonus for resort spending. It was also classified as "3% in Rewards Dollars earned on purchases at gas stations and most U.S. Disney locations". This all went through when the statement closed, at which time I could immediately apply all the Disney Reward Dollars to pay for the Disney Dining Plan charge via Pay Yourself Back.
Reminder that the
Disney+ $10/month bonus needs to be activated, unlike all the other bonuses. On the website: "Rewards & benefits" and then "Benefits"