Liveboating is inherently dangerous, and absolutely required as a pracrice in the dive industry. This is a tragedy and the specific details of how the diver got into the props are not publicly known. Utlimately the Captain is responcible for that even if she swam headfist into the prop on purpose. The purpose of this section of the forum is not to heap judgement but to learn from tragedy. Lets learn the details of the tragedy and learn from them rather than waste everyone's time by asserting our deep knowledge and virtue signal our opinions.
FYI Prop Shrouds are used to increrase thrust and not to protect things in the water, on commercial (not charter) boats they serve the additional benefit of making it harder to get an umbilical caught in the wheel while "walking the dog."