There are only two things to say. First, Shadow, the company that coded the web app, also provided it to Nevada for use at their caucuses on the 22nd.

Second, this was the greatest thing that could have happened to Joe Biden. Every campaign had workers at every caucus site, so they all knew the counts from both alignments. The only thing they didn’t know was the math that would determine who got how many delegates. As the candidates made their speeches before departing for New Hampshire, only the Biden campaign sent a letter to the Iowa Democratic Party basically challenging the results. Clear sign that he under-performed.