That is crap advice. That woman is in an abusive, threatening relationship. He has already cut her off from her family and now he is threatening her. The advice should be get out of there as quickly as you can.
This is very common for women taking on all the household responsibilities, your spouse becomes just another child to take care of, why would you be interested in sex with your child?
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Signed - middle-aged childless man.
Signed - divorced empty-nester.
He is out as incompetent of proper dealings.