The Approved Product Page might be reflecting current Paizo stock levels. For example, the Kingmaker Adventure Path is missing AP 4 and AP 6 (#34 and #36). Per the Community Use Policy, those products aren't part of the Approved Product Page, so their covers couldn't be displayed any more under the Community Use Policy. Is it Paizo's intention that the missing product illustrations can no longer be displayed?
I have poked things, though it may be a while for the website to reflect the information. Current stock levels don't really play into whether or not it displays on that page, but those are certainly intended to be on the Approved Product List page.
Here's the full list of what I could find missing (the numbers helped)
Legacy of Fire 4 of 6
Kingmaker 4 & 6 of 6
Serpent's Skull 1 of 6
Carrion Crown 2 & 4 of 6
Skull & Shackles 1 of 6
Was there a Pathfinder Society Scenario #5-14?
No entries for Pathfinder Adventure Card Game - Skull & Shackles APs