Welcome to YorkieTalk. It is always a pleasure to welcome a fellow Georgian.
Your breeder has some unusual ideas about rearing pups. I admit that I have limited breeding experience, but I would never force wean pups, unless the mother's or pup's health was compromised. Forced weaning is way too stressful for everyone involved. And I would never place pups prior to 12+ weeks of age. Each pup is evaluated individually and placement age determined according to each individual's readiness.
Having pups lose weight at weaning is not something I am familiar with. Around three or four weeks, I start offering the pups a mush made up of ground up puppy food and goat's milk. Most of the mush goes ON rather than IN the pups - and is given with Mom around so that Mom can start teaching the pups to lap up food. When the pups start teething I offer dry kibble to munch on, under supervision of course.
If your pup grows according to one of the Yorkie Growth Chart that has proven to be fairly accurate for me, an eight week old pup at 22 ounces will mature out between 4 and 4.5 pounds. With that said, growth charts are just guides that not all pups follow.
Good luck with your new little one. Would love to see pics!