Well in the case of the hypothetical female desert, selling a desert female is fine but saying it is a great addition for a breeding project is false advertisement, and no better than mislabeling a morph. and I would call it out, not because I like to stir the pot but because there are more and more new people coming to this hobby each day and they do not have the info that some of us who have been in it for years have.
Now if you want to tell me about the specific real case you can PM me.