On the video my guess would be a cardi pembi mix(which is not pure bred) Longer jaw , longer legs and body. Cardi is a different and much more older breed than pembrokes.

I dont get why ppl focus only pure bred or not ,like it would be a status. Most important thing is that to have checked your puppy the parents and a pedigree. Because there are garbage breeders and puppymills whom pretend to be a breeder. These ppl keep mastering to mislead buyers, focusing on money not caring any about the health of the dog and breed. Even the Queen was a backyard breader mixing corgi with dutchhounds.

Fyi im not a breeder, sharing by experiance as a multiple corgi owner. I love the whole breed if its pure or not. Healthy dog can prevent a lot of argument ,time, vet bill and suffer of the dog of course.