just going on the website i would say it is a high likelihood that they support puppy mills. having that range of breeds they have a higher chance of bringing in pups from dodgy breeders.
even so there is not much you friend can do now we live and learn, lets hope that the pup grows into a healthy happy well mannered dog and leave it at that, so long as your friend and you take a more active approach to informing people about puppy mills.
if you really really want to know for sure ring the place and ask them about the pups they have for sale at the moment, their lines, their health scores etc and see what they say. if they have no idea or are unwilling to give details about the puppies background then they will have gotten their pups from a puppy mill.
"In order to really enjoy a dog, one doesn't merely try to train him to be semihuman. The point of it is to open oneself to the possibility of becoming partly a dog." - Edward Hoagland