Laurus nobilis - Decorative only?

The main reason for the warning is that it has been grown as an ornamental plant which means the grower can use chemicals which may be more toxic than those used on edible crops. I would refrain from eating it for a year from purchase, after that it should be ok.

Bay leaves are removed from the food before it is eaten. Tyro gardeners might eat the leaf instead and savvy suppliers may want deniable culpability should any gastric distress put their customer in a litigating state of mind. Also, this variety may be different enough to taste different, so the caveat protects the seller from potential disgruntled customers wanting refunds. Go ahead and try it in a recipe. Any flavoring from one or two bay leaves in say, a whole pot of stew, should not be enough to hurt you.

There are a few ornamental cultivars of Laurus nobilis. They can be used in cooking but whether or not they taste as good as edible laurus nobilis is another matter.