Is it helpful to include a progress indicator when there's only two steps in a process?
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No it shouldn't be necessary.
You could think of confirm as just an action that brings you from information into whatever is after that step.
Since I would imagine that confirmation is just the click of a button, you should just bundle the two steps as one step. This way the user will perceive the process to be shorter.
You could go one step further by enforcing at the top of the information step that they are only one step away from completing their task, how simple is that!