The definition of "Freeganism" at that wiki described it as being "anti consumerist" and some of it is just that. However, part of it, essentially scavenging and dumpster diving relies entirely on the bad consumer practices of others to provide for one's self. If there were no consumer waste for them to scavenge they would have to join the regular consumers. It's silliness to say it's anti consumerist.

Having said that, I love a good dumpster dive find and think wild food foraging and urban gardening practices are great. There are also some other good practices in that wiki.