I don't think this looks much like the JW mosasaurus personally. Pic related. The JW design is rather ugly, it's got a crude broad head and these gigantic osteoderms as if it's a crocodile, and it also lacks any tail flukes. It sucks dick.
That PNSO thing actually looks like a marine predator, it's got a smooth yet textured skin, nothing that causes excess drag, a big tail fluke and some nicely formed upper lips to cover the teeth which is a universal feature in the squamata which mosasaurs belonged to.