I'm more familiar with Server Fault, I started contributing last month (made top of "new users") and it feels good to have helped a bunch of people that thanked you, but I'm a Camel's straw away for giving up between some moderators and how the system works.
While you are right you can deploy with any of those, Vagrant and Docker are virtualized containers, the other ones are "configuration management" tools, I guess that's what the OP meant.
I'm glad to see that most people here are replying objecting that the writer's view or definition of a DevOps is not what seems to be the most accepted/popular view.