Hasn't J. K. Rowling read the book "Hogwarts, A History"? According to Hermione and J. K. Rowling herself, apparation has been banned on the Hogwarts grounds since the founding times:
Some rode broomsticks (a difficult feat when carrying trunks and pets); others commandeered enchanted carts and, later, carriages; some attempted to Apparate (often with disastrous effects, as the castle and grounds have always been protected with Anti-Apparition Charms), others rode a variety of magical creatures.
Source: Pottermore; The Hogwarts Express
In the new trailer, Fantastic Beasts: The Crimes of Grindelwald, we see wizards Apparate at Hogwarts grounds. How can that be?