Seeing a lot of conflation between the lawsuit and the Husch Blackwell investigation. Sorry to rain on the parade but I have to reiterate: they are two separate things.
The investigation found enough evidence of misconduct to merit the actions the University of Iowa took, which included Doyle getting $1.1 million on his way out the door. None of that is in dispute.
The lawsuit was filed after the completion of the investigation, and is a question of whether the plaintiffs are owed damages from the Iowa BOR, University of Iowa, and Barta, Doyle, etc.
All that has happened with the individuals being dropped is that the plaintiffs aren't seeking damages from those guys personally at this time. It isn't a settlement of the suit and it's certainly not a referendum on the findings of the investigation — especially since the UI's arguments include statute of limitations, which is a perfectly legal and valid argument but has nothing to do with the truth of the underlying accusations.
TLDR: the lawsuit isn't the 2020 investigation.