@UnwaryCoin sorry, I misunderstood the last part of your previous message.
I've finished the game on my PS4 Pro a month ago with the latest patch installed and I didn't unlock those skins, so, in order to play with both the "Vanguard" and the "Tundra" skins, you need to play the game on a PS5 with your phisical PS4 "Deluxe Edition" version; you don't need to buy the PS5 version of the game since there's the free next-gen update (according to what the users written on that Gamefaqs topic that I've posted above).
Since no one else replied to this topic I think that now it's impossible to unlock those skins on the PS4 version (unless you have an EA/Origin Access subscription for the Vanguard skin and a code that still works for the Tundra Skins).
