Is this Yellow Fungus?

Hello, We purchased this bearded dragon several months ago, when we purchased it we noticed it had what looked to be a small shedding issue, the seller assured us it was a minor shedding issue and would go away shortly. About 2 weeks after we brought it home we noticed it wasn't going away and was only getting worse. We contacted the seller about the issue, we then found out that they did not breed the dragon and purchased it from someone else and were told the animal was slightly dehydrated and was being kept too dry and we should soak the animal more often, which we were doing. Another month went by and the dragon was steadily getting worse, the seller we purchased from told us it was our poor husbandry skills and improper diet that caused the issues, advised us to put vitamin E oil on the dragon, move its UV/heat lamp further away from the cage and that it needs more hydration. At this point the dragon started to lose a lot of his toes and very shortly after died. We never requested a refund from the seller, just wanted to know what to do to take care of the skin issue. Just recently we became aware that the seller has animals that have Yellow Fungus in their collection and by taking another look at the pictures we originally sent them we noticed the similarities between the conditions it was facing and Yellow Fungus, we have sent pictures to other dragon breeders and they have all said it looks to be like the later stages of Yellow Fungus. Does this look like Yellow Fungus or is it something else?