Don't be fooled. That's an image of the official kit. Same image on this page:
http://www.footyheadlines.com/2017/05/brighton-hove-albion-17-18-premier-league-home-kit.html
Many probably wouldn't as you say, but you can tell from a distance as the American Express logo extends well into the far left and right blue stripes on the official shirt whereas the copy doesn't.
The Nike swish also extends well into the blue stripes on the original as well.