[citation needed for any of your view]

The problem is that it isn't inconsistent and arbitrary, so that would simply be wrong to admit.

There is a tremendous amount of data/studies/etc to back this up, done repeatedly over time. Both independent of Google and not. Certainly much more than any other interview system i've seen suggested or used here.

As for the second, general "Googliness" is not used to turn people down - horrible communication skills/being an asshole/etc are.

Despite your claim, one interviewer noting an issue there will not get you not hired. Two or three noting it would. One noting it and then followup fit calls/interviews confirming it would.

So it's not an effective mechanism for single interviewer to enforce biases anyway.