The mismarking you describe is a minor cosmetic issue and wouldn't usually merit a price reduction below what a breeder would normally charge for a pet puppy.
However,I notice from your previous posts that you've looked at a 20 week old puppy.
If this mismarked puppy is 20 weeks old,I wouldn't be surprised if the breeder would consider a reduction to allow it to a good home.Sometimes small breeders are limited for space and especially if another litter is due,they may be anxious to rehome the older puppy.
However,I would find the breeder's sales pitch offputting.
By suggesting to a buyer that a puppy is "discounted",it may give the impression that there is something amiss with the puppy or that you're getting something substandard.It may be the case that there's a problem with the puppy,or it may just be just poor sales technique.
When buying any puppy,make sure you like it and you think it an attractive pet.
If you have an issue with any cosmetic point on a puppy,remember 12 years is a long time to have to look at this dog on your sofa.Buy because you really like the puppy,not because he's discounted.
Finally,a good breeder is worth their weight in gold.
This means being there to support you if something goes wrong healthwise with your puppy or just sharing an interest in the development and wellbeing of a puppy as it grows and matures.A good breeder will have carried out health testing on the parents,heart and eyes,if you're in the USA,often hip and patella.Many breeders now choose to mri scan their breeding stock to check for a neurological condition called syringomyelia.
Breeders who do not health test, do not have the wellbeing of the breed or indeed the interests of the buyer at heart. Avoid these people like the plague.
Where are you located? There are many here who can give you an indication of the expected price for a puppy in your area.
Sins