Answer:
The account disclosure needs to disclose what their rate and APY are at the time of opening the account. If that rate is a different rate than your standard rate, the different rate is what would need to be on the account disclosure. And yes, when your rates change, the rates on your disclosure need to change. The language you have about rate changes covers rate changes AFTER the account is opened and saves you from having to redisclose to existing customers when you change their rates.