I think you guys are parsing that sentence as “relatively new cargo, bauxite”. At the top of the article they define “solid bulk cargo” as a shipping jargon term, for a fine granulated material. This seems like a dangerous misnomer to me...

I’m assuming that means that historically, the refiner owner the pulverizing equipment and shipped in bauxite rock or gravel as raw material. When you hear of liquefaction in terms of earthquake damage, they are always talking about saturation of fine materials. Saturated gravel doesn’t behave as badly as saturated sand or clay.