That's what I think as well. Most likely just daily pricing updates for the exact legal reason SoyViking says.

I worked IT in grocery for a long time. The company I worked for was starting to sell these as I was leaving so I don't know a lot of the behind the scenes talk anymore, but the general thought was just for it to be a replacement of the paper labels that they usually replace weekly anyway. Maintaining shelf labels is actually a huge pain in the ass.