Role of Ament in ROS 2 package creation

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In the Creating Your First ROS2 Package tutorial, the command to create a new Python package is:

ros2 pkg create --build-type ament_python my_package

I'm confused by the appearance of ament in the above command. Since I am using Dashing, I would not expect to use ament_tools or probably anything with ament in its name, since ROS 2 is now using colcon.

Is this a vestige of earlier releases, or do I have a misconception?