Soybeans need to be cooked for a good long time to inactivate the bad stuff..
It takes as little as 10 minutes of cooking. This is a "long time"? It takes that long to cook my pasta!!! And it takes longer than that to cook raw soybeans.
As for the study I want to point out that first of all we are not mice and do not share their chemistry. Secondly there are many studies showing the anti-cancer properties of soy. And if you look at the study you cited you will see that soy flour had no effect on the cancer despite the fact that it would still contain the phytoestrogens. When molasses was added though there was cancer cell proliferation. So maybe it is the molasses promoting the cancer. Molasses contains both sugar and iron, both well known for proliferating cancer cells.