ttbooms

In the papers you linked, I can't see any studies where the subjects were consuming an equivalent amount of soy to the 60-year-old soy milk enjoyer. Looks to be much less in all of these trials.

So it seems the question hasn't been conclusively answered. But the case study hints at the possibility of an excessively high intake of soy having an estrogenizing effect, even if we don't know why. Maybe he had some particular configuration of gut bacteria that helped this process along, or something. More research needed.

Actually there may be such an effect for men who consume large amounts of soy, see this case study: https://pubmed.ncbi.nlm.nih.gov/18558591

Breast growth, erectile dysfunction and decreased libido in a 60-year-old male who drank about six pints of soy milk per day. With no other cause indicated. His symptoms ceased after he stopped consuming all this soy.