Unlike startups, it's not like Google's business depends on investors supporting lofty goals. There would seem to be no benefit to faking a demo like this.
Not revealing the business location is likely just because they consider their business partners to be business data that they don't want to give away to competitors. Clean auto could easily just be done via a simple noise filter, just for the sake of the demo. When you have a little noise in your ear, it's not bad. But when you need to broadcast sound to an entire stadium, you need to rebalance it. This story is a load of nonsense.