The answer is very straight forward: NO, NO NO.
Dont even bother calling on the US national or US citizen differentiation.
THe question on the form is if YOU have made a claim to citizenship. It never asked if anybody has mistakenly listed you as a citizen. For all I know, I may have been listed as a citizen on one of my bank accounts or other institutions. I have no idea.
SO just forget about it as long as you had them change it. If you now know about and do not proceed to change it, then the story moves from being their mistake to you giving consent.
HAve the bank change it and let it go.
My thought exactly. The question is about the applicant making a claim not about someone else. The applicant cannot be responsible for another person's/institution's actions.