Baby's Cells can Enter Mother through Pregnancy and Manipulate her Physiology

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1. How does this not blow the "natural selection by mutation" theory out of the water? I'm reading this as proof that physiological adaptation can be inherited
2. Does this indicate some advanced form of cuckoldry? If you have a child with a woman who was already impregnated by another man, then your child could possibly inherit the other guy's DNA through the fetal cells that were transferred into her through her first pregnancy

article: https://www.smithsonianmag.com/science-nature/babys-cells-can-manipulate-moms-body-decades-180956493/
research: https://www.researchgate.net/publication/24178122_Cell_Migration_from_Baby_to_Mother