That's possible. I don't know the current status of it, but in the 90s the FDA had ruled that dairy farms which didn't inject their cows with supplemental bovine growth hormone (BST) couldn't put that on the label. Their argument was that putting "BST-free" on a label suggested that BST might make the milk less healthy in some way, and the FDA had ruled that it didn't, so you weren't allowed to market your milk in a way that could give that impression.
Kind of bizarre, considering that food advertising routinely suggests all sorts of good or bad things about products, like the idea that if you drink a certain brand of beer or drive a certain model of car you will be surrounded by hot models. But there's long been a revolving door between Big Ag and departments like the FDA and USDA, so not exactly surprising that the FDA would go to bat for a Big Ag Pharma product.