It's hard to believe, as only on servers with pvp, the balance tends to be heavily tilted towards the horde throughout all regions. Blood elves are 1. "pretty" 2. Horde, in which you don't have to fight against racials. offer better racials in pvp over Draenei, their Alliance counterpart. People will of course play them. They were created to tilt the population towards horde.
In the modern world, racials have become not really relevant unless you're maxing for 0.5 percent. It was likely to be referring to the fact that alliance players find themselves constantly being cheated by legends (taking more losses than Horde, and other things).