IIRC, AOL is owned by Talktalk and I can't see them blocking iPlayer.
TalkTalk don't block iPlayer.
AOL UK were bought by Carphone Warehouse who then sold it to TalkTalk. Continued access to the AOL portal and other core AOL features was retained as pat of the deal. Therefore AOL UK customer traffic is likely to be routed in a different manner than TalkTalk customers.
TalkTalk and AOL is not like the wolf in sheep's clothing scenario that is BT and Plusnet.