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This is nonsense - none of this is possible - eg, there is no way to make gametes from stem cells

Of course it is possible - where did your sperm come from, if not stem cells...?

And gametogenesis research has been advancing rapidly recently, so it probably won't even be that long. One can do stem cell->gamete and successfully create offspring in mice https://www.gwern.net/docs/genetics/gametogenesis/2021-yoshi... and there are already startups to try to do it for humans: https://www.technologyreview.com/2021/10/28/1038172/concepti...

Their proposal does not include making gametes from stem cells. That is only required for IES, which they describe as a 'concept'.