Well is this rhetoric or reality time will tell.

The SA Navy will deploy warships on Africa’s west coast as far north as the Gulf of Guinea. The deployments, early next year, will involve frigates and possibly submarines Johannesburg daily, The Times, reported. Ships of the Namibian and Angolan navies will also take part in the operation to combat pirate attacks. Oil tankers have been the pirates' preferred targets.
Link:http://www.defenceweb.co.za/index.ph...ity&Itemid=233

Yes a small number of oil tankers - with product, not crude oil - have been attacked and recently there was an attempt a long way offshore from Nigeria.

Open sources do not suggest either Angola or Namibia have a navy beyond a few patrol vessels.