Here are some more actual real-world numbers. Just some additional food for thought.
Nashville has a commuter rail somewhat similar to what is planned here (but twice as long 50% more station, 50% more runs each day, and of course a much larger, faster growing, and congested metropolitan area). The first year ridership projected by their team of experts. 1,300. Actual ridership at the peak last summer: 640.
No reason at all to question a 2,200 projection for Tulsa... no reason at all... ;-)