To the original question - or statement in this case - Halloween IS about witches, but to Wiccans, it also very much includes death and the departed.
When the festival was adopted by Christians, they celebrated All Hallows' Eve followed by All Saints Day.
Wiccans, and some Pagans, often celebrate from sundown on 30th October. Death is the central theme for Pagans and Wiccans because they don't fear it. Folk who've died during the year are remembered, and those born during the year are welcomed into the community.
Halloween is the Christian name for the celebration, but for those who celebrate Samhain, it's to celebrate the last of the crops and fruit before Yule, or winter, sets in. At this time, it's believed that the divide between the other world and that that of the living is at its thinnest. The elderly are considered with reverence, because the "witches" of old were usually the wise women, who lived just outside the villages and relied on nature to provide them with their food and herbal cures. They also had a connection with animals, and could read the signs of nature - e.g., when cows lie down before impending rain, etc. The love of domesticated animals brought about the stories of familiars, and unfortunately, the "burning time" was when these women became feared and persecuted, although most were hanged, not burnt at the stake!
The idea of witches casting manevolent spells on people is untrue, as they believe in the three-fold law which'd bring back any intended harm upon themselves three times over, and the commercialised idea of Halloween, is the "fairytale version" of what really happens.