Yes, de-plating is well recognized as a recovery technology. In fact, the title of this thread is "Reverse electroplating for gold recovery". The anodes for gold & platinum plating are typically platinized titanium, so that material can certainly be used as the cathode in the setup you are describing -- but stainless steel is usually good enough, depending on the particular plating bath.
In motherboards there is gold plating on different types of socket pins. There are BGA, QFP and PLCC chips mounted on motherboards, they all have enough gold and some silver in them. Now talk about the recovery. Only one gold extraction method cannot be used to recover gold from all parts of computer.
As we've said repeatedly, recovery of gold is serious business, and step 1 is determining how thick the gold plating is. This is absolutely essential, not just to know whether the effort is worthwhile, but to track the gold content through each subsequent step so the appropriate amount of chemicals can be added.
Gold recovery from gold fingers and gold plated boards using the A/P method or Acid peroxide is in my opinion the best way to get started in gold recovery. If done safely, this is a very fun hobby! Using Muriatic acid and hydrogen peroxide, you can dissolve the copper and nickel etching that holds the gold foils to most boards.