Hi -- I've been a finalist for the Hugo Award fifteen times, in five different categories. I've won three of them. I'm aware that Hugo Awards are given out in a lot of categories.
But I find no evidence that, for instance, Roland N (Gostry) Neill, or David Dodd Hand, or Percival Pearce, ever won a Hugo Award. All of these people are listed as "Hugo Award Winners" on Wikitree's page of that name.
What it looks like from here is that people who worked in various capacities on old Disney movies, like Bambi or Fantasia, are being listed as "Hugo Award Winners" because those movies, decades later, won "Retro-Hugo" Awards.
If Wikitree wants to define a "Hugo Award Winner" as anyone who worked in any capacity on a work that won a Hugo Award, well then, since a lot of big Hollywood movies have won Hugo Awards, by Wikitree's definition there are at least several tens of thousands, probably hundreds of thousands, of "Hugo Award Winners." That's fine, it doesn't hurt anyone. But it's kind of an odd position to take.