As someone who grew up in Mozambique I'm shocked and excited to see a metal band from there. As for South Africa I would also recommend Architecture of Aggression and Bile of Man, they were pretty cool.
strange picks for Australia, would've thought disembowelment would make the cut if we're going for older stuff since they're one of the seminal death/doom bands. I guess they're not strictly dm but then neither is alchemist. nice list though