Your link takes us to 1992, a bit before the premise of ingested hormone or hormone mimics became a subject of study; it seems the authors are just stretching the subject group.
True but as you see in table 1 they did a pretty thorough examination of their reproductive organs. I would imagine that if the males were producing eggs in their testes 13 years ago, they would have noticed. Hornyheads have been looked at quite regularly for other toxins so one would think that feminization would have been recorded previously under these other monitoring efforts. My point was that its not like they hauled in some strange critters off the ocean floor that they knew little about, found males producing eggs, and immediately blamed it on estrogen mimics.