When I started this thread I didn't expect to get so many responses. There are clearly differing ideas about how important disclosing a digital step in the process is and I respect and appreciate all of the opinions expressed.
For me, if I ever become a competent enough platinum printer to be able to sell my prints I will feel the need to find a simple way of labeling them so as to differentiate between analog and partially digitally processed prints. After 40 years as a self employed provider of services the habit of ensuring that clients know exactly what they are buying from me is too deeply ingrained. That doesn't mean I think for one moment that I am right and others are wrong regarding the subject of this thread.
Many thanks everyone for your input.