Sure - but it's proper name is/was 'American Express Community Stadium' as that article immediately makes clear. That's what the sponsors would have wanted to see on media with a much wider reach than the club website. For instance, on the TV graphics that are seen by hundreds of millions of...
Everyone, including the media, will verbally call it the Amex regardless. It’s possible that dropping ‘community’ is to encourage TV companies & the press to use the entire name in writing, as it’s a bit long with the correct title. I think I’ve seen it shortened incorrectly to ‘The Amex...