I've spent quite some time researching this subject, and I've never heard of the Germans wanting Malta, Indochina or Malaysia, and they definitely didn't plan to annex Poland, Lithuania, or Courland. Additionally, my understanding is that Mittelafrika wasn't intended to be a coherent territory, but rather a zone in which German companies and trade could operate without competition while Belgium, France, etc. would still administer and maintain the colonies.And here we have the German Empire's ambitious goals for the first World War. Would easily be the biggest land exchange in history if it actually happened.
I suspect this is a map of the German Empire in Kaiserreich rather than an accurate depiction of their plans.