Will Ryanair's one bag rule affect airport shopping?

There seems to be confusion as to Ryanair's strict enforcement of the one bag rule. Will aiport purchases still be allowed on board in separate bags? This is how another blog sees it?

Rules are rules, right? You are made aware of the one-bag-per-person rule when you book. However, what is not clear at present is if Ryanair will also fine you for any shopping you may have bought after you have checked in (I can't find out because Ryanair doesn't have a press department!). Presumably they will, because otherwise clever passengers will simply buy a bar of Toblerone and then unload their extra bag into the shopping bag that their purchase came in.