I literally know nothing about this individual, so I can't speak on everything, but alopecia is a common occurrence for Pomeranians, genetically speaking as a breed.
They are a double coated dog (like Huskeys, Samoyeds, Akita, etc), so they should NEVER be shaved or cut into a lot of styles that they do at pet grooming shops to make them look "cuter", especially when they are puppies, because it can actually change their coat forever. Which, as seen from the pictures has been done, but who knows if he asked for it not knowing any better, (please research your breeds when adopting) the manager, or if the groomer recommended it (in which case, they should not be grooming if they put aesthetics over the dogs health). This also causes a lot of Pomeranians to have a sudden onset of alopecia that either takes a LOT of care to make their fur grow back, or sometimes their fur will never recover and they gradually lose more and more. Which, is why, again, you must groom a double coated dog in a very particular way, because they rely on their coat for temperature regulation. To stay cool during the summer, and warm during the winter. If this balance in their coat is disrupted, then you as their owner have to take extra care to make sure that they don't get too hot or too cold, and also use means to protect their exposed skin from the sun. Not here to lecture anyone, I'm just explaining from my grooming knowledge for anyone who didn't know prior, because you never know when random knowledge may come in handy lol.
Also, taking them to a groomer to get washed and dried is better for the dog over doing it at home. That way, they can use a high velocity dryer to blow out all of the shed stuck in the fur much more efficiently and it's less stressful on the dog over being dried with a noisy human dryer and being brushed for hours by someone who, may mean well, but may not know the best, most efficient and least painful way of doing so. So, I say taking the dogs to a professional is a responsible decision in the end, and good pet ownership. Just research your breeds grooming needs and make sure the groomer you choose is knowledgeable on them as well. 🙂