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.
No because your source isn't a study but a case report.
And again even if we take your source at face value it's a 60 year old man (which mean less testosterone production) who consumed an absurd amount not something most people will consume.
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.