Having been one of those people who spent a few hours doing just that, you would need a literal god to create an incredible 3D cinematic-quality Bolvar image, an incredible logo design, and also have the chops as a 2D concept artist to match the style for that enviroment art of "bastion". Then also graphic design skill and knowledge to mock it all up in a way that looks exactly like Blizzard would do it.
Like imo the easiest answer is this is all real. I'll still leave a 5% chance a group of very talented artists and designers got together for the best trolling of their lives, but the simpler answer makes way more sense.
I did these fan ideas btw and they are complete trash by comparison