The rates you mention are risk rates WITH modern medical care, proper gestational nutrition, clean water, etc.

The hypothetical women on the island WILL NOT have that. Their risk factors of hemorrhage and child bed fever will explode. Also, most modern women have lost the knowledge to assist a birth and recovery afterward sans that medical care. You men never had it.

I return again, that any supposed data on maternal mortality rates during prehistoric times is mostly speculative because it was prehistory. We do know it was significantly higher than today because of the population curve. We don't know how much of that, in women, was due to maternal mortality and how much of that was due ro other factors. Bones will not record all those possibilities and we don't have enough bones of prehistoric peoples to have meaningful statistical rates.

The second woman will end up being murdered by one of the two men. Or one man will murder the other. Or both.

Accurate statistics rely on parameters being accurate. You change the dynamics within thr model and the statistics will change. That's why all those "so many men and so many women" on an island statistical models are ridiculous and shouldn't ever be used in any serious discussion over who fares better, which gender.

People who use them aren't serious people. They're just pushing a narrative they want to believe.

Truth is we don't know. People are complicated and all 'evidence' and mathematical modeling that conveniently leaves out aspects of the human condition is bunk.