The information from the man has been available for a week or so. It's not new information, it's just a new media report. None of the information provided by the man match what we know about Mollie.
Mollie went jogging at 7:30. Her run typically lasted 45 minutes. This man saw a woman at 9PM - so wrong timeline. Mollie was wearing shorts and a pink sports bra. The woman seen by the man was wearing a pink top and black khaki yoga pants - so wrong clothing.
Similar information, such as pink, black, running, is not "same". Similar is not good enough when a woman is missing.