In fairness, when Wicca was still a very new religious movement, there was a strong tendency to claim roots to antiquity. Lots of new religious movements do that, and a few decades ago there wasn't a lot of easily accessible scholarship debunking that claim. There is now, and it's my understanding most Wiccans and Neopagans accept the evidenced history of Wicca as opposed to the mythic history that used to prevail. There are still a few that don't accept the scholarship, either because they've read older books that have the dated information (and genuinely don't know it is wrong) or because they choose to enshrine the mythic history over the evidenced history. Doesn't particularly bother me what people believe on that either way.