Did the article actually conclude that though? I just read up until the point they were talking about strippers and lap dance tips being correlated with fertility and luteinizing hormone -- which doesn't seem to be about bacterial microbiomes.
Don't know which discussion on HN this was, but it was about the same book. Basically, each of us produces a varying amount of fat in our sweat and that leads to different bacterial biomes. The bacteria that metabolize the fat in the sweat are what actually produce the odors we recognize.