Notice something in the first one? The involved ones got jailed by Ghana. China did not prevent them facing justice. Almost as if the state of China is not looting Africa.

The one named company in the second article is from HK, where the PRC has limited authority regarding stuff as that.

China is not utopia, but the PRC has shown time and time again their willingness to comply with local law. If one of its citizens does illigal shit somewhere, it let's the local authorities handle it and does not demand special treatment. A good example is your first link.