Yes, in order to purchase and acquire PlayStation exclusive packs and cosmetics, you will need to launch your Sky account from a PS4 or PS5 in order to gain access to exclusive content. If you do not have access to a console, your purchases will not be applied to your account until you log in to Sky on your PlayStation.
However, If you do not have access to a PlayStation, you may be gifted the Journey pack by a friend with a PlayStation console and account.