If the paper was bad it should have been rejected by the conference to which it was submitted. If the paper was critical of things Google does and it didn't like that, that's pure suppression. And, as you say, academic norms provide a period of rebuttal, it's unclear how much was allowed here.
Secondly there is value of having anonymous review in an academic setting, however it sounds like they tried to enforce that anonymous review for the company, which again doesn't serve the same purpose. People should be told exactly why decisions are being made so they can correct their mistakes in the future. If you aren't willing to invite someone into a decision making process, when a large portion of their research is in biases in institutional decision making, then you have got to know you're in for a bad time.