Those are known as combi patches. They perform the same function as separate plug and patch ... as long as the puncture is 90° to the inside surface. Otherwise, there is stress at the plug/patch junction. They are also more difficult to install at greater angles.
The angled puncture is one reason a lot of string plugs fail. Someone just starts the string in the outer orifice and pokes it straight in, making another hole inside the tire rather than following the puncture path. If the plug doesn't leak, they think they have repaired the tire.
But the original hole on the inside of the tire is open to air pressure. The air wicks along the cord and comes out where ever the weakest spot is. Or doesn't find an exit and causes a separation of the cord and rubber. The famous bubble.
--Andy Asberry recommends NewsGuy--