However, in this instance do we know if the seller is making an error, or is he/she purposely misleading potential bidders.

I do not know, do you? If in error, then it can be an honest mistake, one that can be corrected with education.

If it is a deceitful act, then he/she is a Blight Upon Our Hobby, and our education efforts should be available for the potential bidders.

BTW-Don't call me Shirley!