As the subject says, AIX has content labeled “Third Party” but now way to see it other than some variation of “All content”.
as viewed from: 
So, when looking from (where I normally look) - none of these show up:
Not even in the “Patches for AIX…” “all category” selection. I assume they do not show up here, because “Third Party” is not one the sub-menu supported categories.
Hope this helps!