The unionization side lost the vote, which tends to imply that they are less popular. Despite that, all of the quotes are from people who supported the unionization. They have "a worker... who helped organize the union drive" and "the president of the Retail, Wholesale and Department Store Union that led the organizing effort". The article picture is of a pro-union protestor. They don't seem to have made any effort at all to find or quote people who were against it. They instead framed all opposition as obviously due to Amazon's "propaganda".
So what could be the reason for this - are their reporters just lazy, or are they hopelessly biased in favor of unionization? Well let's be honest, it's obviously both.
I'd also be interested to know here, what is the nature of the proposed unionization? Is this just Amazon workers, or would they become a small part of some massive national union organization? It quotes the "president of the Retail, Wholesale and Department Store Union", and their picture has some rather nicely printed signs by them, so I know which way I'd bet. If this unionization actually went through, would the individual workers have any say in what their contract would be, or would they just have to take whatever this massive national union thought is good for them? That might be a pretty solid reason to vote against it. Funny how it doesn't say anything about that.