There's really zero incentive for line-level engineers & security folks at Google to engage in conspiracy to defraud the court. The penalties that the involved

There's really zero incentive for line-level engineers & security folks at Google to engage in conspiracy to defraud the court. The penalties that the involved individuals could potentially suffer would be far worse than whatever distant benefit they get from Google winning the case (and it only takes one defector to ruin your plan). It's not logically impossible for such a thing to happen, but I would consider sworn testimony from multiple Google employees "proof beyond a reasonable doubt" that the purported access did happen.