You have no idea what you are talking about. Blizzard's art team is a precious commodity, it's in many ways the heart of their company. They are always hiring someone who can do what they need, because it's so rare to find someone.
They not only need to have an affinity for Blizzard's style and content, they need to work well and have the right attitude. They have to share the design philosophy.
There's no corporate conspiracy here to make it look like they're doing well. They have something called an earnings report every quarter and it's not private information.
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Actually some of the models are a decade old with some tweaks.