You do not understand the argument from authority. Argument from authority would be if PG had said that I'm right because, say, I had a Ph.D. But being an early Google employee when the topic under discussion is the early days of Google doesn't make on an authority, it makes one a primary source.

But you may have noticed that I did not bring this up. That's because your factual claims are easily debunked with information from the public record.