Really not sure how you’re conflating product demos which are known to be pie in the sky across the industry (not just Google) with peer reviewed research published in journals. Super basic distinction imho.
All of the highest impact papers authored by DeepMind and Google Brain have appeared in Nature, which is the gold standard for peer-reviewed natural science research. What exactly are you trying to claim about Google's peer-reviewed papers?
Nature is just as susceptible to the perverse incentives at play in the academic publishing market as anyone else, and has had their share of controversies over the years including having to retract papers after they were found to be bogus.
In and of itself, "Being published in a peer reviewed journal" does not place the contents of a paper beyond reproach or criticism.
From personal experience: in Nature Communications the handling editor and editor in chief absolutely do intervene, in my example to suppress a proper lit review that would have revealed the paper under review as much less innovative than claimed.
