If you aren't responsible for your own actions, and have been probated and your driver's license revoked, then the argument for having you retain a weapon seems weak.
While I do not necessarily disagree if I understood the original article and the VA process there is no hearing involved. From what I understand if a person has a fiduciary set up to assist with their finances they automatically are denied the right to buy a firearm. If they don’t like the decision they then have to appeal to have their rights restored.
So, if I read this correctly a Veteran who has trouble focusing on detail and asks that their parents be allowed to handle their affairs automatically loses their right to buy a firearm.