Why in the world does this make it worthless? They've discovered an effect above and beyond any possible aesthetic trends in the assorted races; if they hadn't included that control, the data could be written off with "well, maybe white men are just all so ridiculously attractive, of course people write them back".
They also ignore massive selection effects. Most significant, and obvious, is the fact that most OKCupid users are white. If I were a black or Asian person interested only in other people of my race, it would be much wiser for me to find a site dedicated to finding people of my race, which exist. If I'm white and I only want to date white people, there are so many that I'll be just fine.
There was some talk here about height taxes, but there's a better solution - redefine shortness as a treatable condition and use HGH to cure it. They even got FDA on board with that, at least for 1.2% shortest people.
Unsatisfactory sexual performance became a treatable condition with Viagra. Depression and hyperactivity became treatable conditions with SSRIs. Being ugly is already almost considered a treatable condition, at least one can get that impression from cosmetic surgery ads. Being overweight is universally considered an illness, even though we don't have too many effective treatment options (surgery is unpopular, and effective drugs like fen-phen and ECA are not officially prescribed any more). If we ever figure out how to increase IQ, you can be certain low IQ will be considered a treatable condition too. Almost everything undesirable gets redefined as an illness as soon as an effective way to fix it is developed.
I welcome these changes. Yes, redefining large parts of normal human variability as illness is a lie, but if that's what society needs to work around its taboos against human enhancement, so be it.