What? No they weren't; you are mistaking day 1 purchases, which during WoW's most popular time frame was limited by physical sales.
Bnet Launcher didn't even come out until 2013/2014 and prior to that only Cata offered digital downloads on day 1. Not to mention those day 1 purchase numbers include pre-orders which aren't made on the same day, Blizz is condensing 6 months of purchases and applying them all to one day (even though they account for them as sales during the 6 months as well.) Just from pure sub numbers and player count assumptions we know current wow does not sell as well as it used to.