I think you may assume too much, the 1992 study seemed to have strongly defined parameters.
A letter to the authors of that study could prove enlightening, though.
Perhaps, though you would think slicing open gonads would reveal any feminization. Like I said this was just 1 article that looked at sex and life history traits with no mention of feminization. During the early to mid-90's, scientists were frantically looking for human caused abnormalities, I find it unlikely that they would have missed something like this.