Possibly her contribution was important, but tbh it's also generally easy to cherry pick records to invent narratives like this.
Ocasio-Cortez again asked Cohen if the former president had ever inflated his assets. "Yes," Cohen answered.
This fraud was already documented at the time by journalists. Do you call this the "beginning", then? Also, Cohen was collaborating with authorities. Would the investigation not happen without that testimony?
Although AOC contributed there, this article is rather shallow as it misses the bigger picture where AOC was not in the center in my opinion.