If only that article linked to actual studies to backup those claims. The article also discusses rats at length, but doesn't support any of its claims with human studies. The one link I attempted to follow is a dead link. That being said, my confidence in the author's ability to speak intelligently on this subject is pretty damn low.
So here are actual human studies with data.
Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis.[1]
Isoflavones made simple - genistein's agonist activity for the beta-type estrogen receptor mediates their health benefits.[2]
Soy food and isoflavone intake in relation to semen quality parameters among men from an infertility clinic. [3]
So here are actual human studies with data.
Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis.[1]
Isoflavones made simple - genistein's agonist activity for the beta-type estrogen receptor mediates their health benefits.[2]
Soy food and isoflavone intake in relation to semen quality parameters among men from an infertility clinic. [3]
[1] https://www.ncbi.nlm.nih.gov/pubmed/19524224 [2] https://www.ncbi.nlm.nih.gov/pubmed/16513288 [3] https://academic.oup.com/humrep/article/23/11/2584/2913898