This article looks like an odd repackaging (wink) of the original: https://medium.com/loceye/how-we-predicted-tropicanas-big-fa... ...Which is also maybe a bit tenuous, given that they just had people do eye tracking on renders of the packaging, and the two cartons are angled differently. Does that translate into real world eye attention?
My guess is that Pepsi didn't know what they were doing, hired an agency who came on really strong with a ton of bravado about how their instincts trump research and got sold a pile of magic beans.