It does seem to be more about "dating" polyamory than marriage issues, but still a starting point to stir the pot.
I don't know.
To me it seems like selective check on scientific research. Conclusion is always: it's bad for women, therefore it's bad. See our tradition is right.
Epistemiology of such reasoning is deeply suspect. Looking only for evidence we want. Plus she doesn't provide what I consider worst sin in such activities. Causal reasoning, step by step. Reasoning is wholy: Polygamy == something bad, see research. Why? Higher rates of mental issues of polygamous relationships can be due to many issues, many not connected with any relationships.
For example, one case of her reasoning.
Clip of women who during her non-first pregnancy has dating husband. Well, they follow established rules in such culture, so she has ability to set rules. Husband must date out of town. Woman complains lack of time due to trying to be all.
This girl from video concludes it's because they aren't trad and husband isn't helping.
A) pregnant lady isn't stupid, and husband refusing help is bad move, therefore it's very higly unlikely it's was systematic. Also, pregnant lady could directly complain of lack of support and yet she doesn't to that.
B) Pregnant lady directly says it's trying to be all which is highly likely correct reason. Reality is it's very easy to take on yourself way more work than you have time. Just volunter for both profit and non-profit projects. World isn't lacking in them.
And additionaly, hard-working culture and culture "you can be everything" will produce overwork. So reasoning of pregnant woman is correct.
In the end, since stupidity has inheritable aspects, I doubt I would ever provide any opportunity for this podcast lady to have children with similar reasoning skills.