Siaf/Nortus is not legit, just a trick trying to lift the share price. Nobody from Siaf has been to Angola, Siaf can't develop it's own projects, Nortus is not mentioning this anywhere.
Those news you read are just re-sending the things Siaf feeds them as legit news, they include no analysis or understanding of Siaf. Who understands Siaf understands it's a scam. There's no P/B 0,015 and P/E 0,5 companies that are broke, lie and dilute. Only scams. And scams don't get these contracts and couldn't do them even if they got them.
Fake news.