Having the bellysliders, I going to have to disagree with the article as far as being doomed. They actually look very healthy and maturing nicely. They just swim along the bottom like a pleco. heh
I just did a quick count in my small tank, and I think 3 of the bellysliders are maturing into males. So, while they may not "fly," it is not genetic and they just hatched as premies basically.
Which means these belly sliders could still spawn.