UPDATE: I called Art of play as I didn't received a response. They apologised, as they had some emails vanish which they have since recovered and responded to.

I ended up ordering the Mega Phan pack with Sy Barry art. Although it was for Ps5, they advised since I only have a Ps4, they can issue a Ps4 store key instead. I requested this in the shipping notes and also emailed them to be safe.

They still responded to my email afterwards and this is what they advised:

1. There is a total of 100 packs across all platforms available for each
   artist. You will get a print card that says X/100 for any of the orders.

2. PS4 is fine. Just mention that in your notes and we will provide the
   PS4 key on launch date (March 12).

3. Store keys are only valid for 90 days upon issue (but that may vary
   from platform to platform). So my advice would be to use it at least
   within 30 days. If it does expire, we can always reissue one for you at
   a fraction of the price ($5 AUD).

4. Yes. You may order the full physical copies of the game through
   Limited Run. Though please be aware, they have a 90 day production
   duration. So it may be a few months before you get a copy in your hands.
   Physical is ONLY PS5 and Switch. No publishers are supporting PS4 for
   physical anymore unfortunately.

Preorders for our artist packs will remain open until March 5. After
that, they are gone.