It's certainly appears that Stroz Friedberg doesn't want their due diligence report to be made public. Really, really, really doesn't want it out.
What are the possibilities:
1. They didn't find any issues, and documented how a few months old company developed technology that was worth $680M plus an additional chunk of future revenue.
1A. They were incompetent, and missed the obvious similarities to what the founders had been working on at Waymo
1B They did a wonderful job and extensively documented the innovations, along with the differences from the work the founders had done in their previous employment. Since it's a questionable $680M deal, the report would be at least 100K pages long.
2. They found a slew of issues.
2A They accurately wrote a report that pointed out Uber was buying stolen trade secrets. Uber went ahead with the deal anyway. They are objecting to the release because, uhmmm...
2B They wrote a willfully blind report that carefully stepped around the obvious signs.
I'm guessing they were well paid to write a report that was willfully, crudely blind to the issues. If made public (and remember, they didn't even want 'Stroz Friedberg' to be mentioned in court) it would show how unethical they were willing to be.