I agree...notice that they are described as dachshund-TERRIER mix. Hmmm...isn’t there a breed called Pitbull TERRIER? I have a feeling there should be more emphasis on the TERRIER side of the mix.
Did you watch the video and see the dogs. Apart from being dogs, they have virtually none of the typical characteristics of pit-bulls. It’s more likely they are mutts which are predominantly dachshund and rat-terrier (or other similar smaller terrier).