Dude, I'm Asian, I think this guy is totally nuts for getting rid of all the "icky guts" of the crab. As Bunk said in the Wire: "Damn white people, throw away the best part of the crab." But you DON'T eat the gills on a Dungeness Crab, that is just plain WRONG.
I believe that what he means is that the gills are actually very bad for you. The gills are full of toxins and metals that the crab (a bottom feeder) has come into contact with during his lifetime.
I'm sure that they have a nice texture and may be completely edible for some species but for dungeness I would strongly suggest not eating the gills.
I'm sure that they have a nice texture and may be completely edible for some species but for dungeness I would strongly suggest not eating the gills.