I received the exact same letter, so that's definitely an ADR.The PDF title in my CIC portal is "Procedureal Fairness" but the document itself is this and multiple have said to be this is simply ADR and not a Procedural Fairness Request:
If you don't have any liabilities or loan than I would not worry much. Just make sure you showcase them as much funds as you can instead of just minimum requirements. Also, make sure your bank letter meets all the requirements for the letter as mentioned here. If they had a doubt in case of authenticity than also they can issue you this ADR which was in my case even with a canadian bank.