The claim was very specific: Prove this data isn't from the 2020 election. All you had to do was actually include 2020 election data in the set. And right there, the problem becomes much harder.
Hell, you could have just used a dump of 2020 election data and been fine. Just claim it proves your accusations.
And that's probably part of the reason that they worded the challenge like that. Because it's the easiest one to manufacture reasonably well. Yet they still fucked it up.
I still cannot believe how anyone can believe in the competence of anyone in Trump's political sphere after the Four Seasons fiasco. How often does one have to kick themselves square in the dick before people start wondering if they're not the sharpest bulb in the box?