True, but that also means the last couple of months pulled the statistics down to slightly belowe average for the drukhari and it is something you could say about almost any index army.
Some of the index armies have a better winning ration compared to the player percentage, chaos demons, sisters. Some worser: T'au, Necrons. Overall Drukhari seems to be pretty average positioned for the index armies, not bad, but also not good.
Oh and something i also forgot to mention. They also have the participant numbers of 7th edition tournaments in 2017. Drukhari numbers are growing, we are on place 6 for fastest growing faction. On place 3 if you look at the index armies, only Ynnari and Orks are growing faster. And it was to be expected, that Ynnari is at the top, but it seems only the asuryani and eldar corsairs are swallowed up by ynnari.
Maybe GW realises the potential, one can hope.