All health professionals say they are supportive of breastfeeding.
But many are supportive only when things are perfect, and some not even then. As soon as breastfeeding, or anything in the life of the new mother is not perfect, they advise weaning or supplementation. These samples and literature are inducements to use the product, and their distribution is called marketing. There is no evidence that any particular formula is better or worse than any other for the normal baby. The literature or videos accompanying samples are a means of subtly and not so subtly undermining breastfeeding and glorifying formula.