I mean honestly, even if Iowa did beat an undefeated tOSU, the committee could write it off as a fluke win. A lot of other undefeated and one loss teams would have multiple better wins on their record.
I give credit to Iowa though. They are doing their job and winning. That's the only thing they can do. But they do not control their own destiny for the CFB playoffs.
Nobody among the teams battling for the final spot is going to have multiple wins better than beating a 12-0 OSU team on a neutral site. Good god. There are only a small handful of wins out there that would be as good as that (basically beating any of the top 10 teams in their home stadium), and we obviously aren't going to see all of them happen.